Apparatus and method for controlling in-device coexistence interference in wireless communication system

ABSTRACT

A method and an apparatus for controlling in-device coexistence interference (IDC) in a wireless communication system are provided. The present invention comprises transmitting IDC indication information including an unusable frequency band that is a frequency band in which performing communication is difficult because of IDC interference to a Base Station (BS), receiving Radio Resource Control (RRC) connection reconfiguration including IDC Discontinuous Reception (DRX) configuration reconfiguring DRX relating the unusable frequency band based on the IDC indication information from the BS and performing autonomously denial of Industrial Scientific Medical (ISM) transmission in the unusable frequency band by reconfiguring DRX based on the IDC DRX configuration.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.14/801,280, filed on Jul. 16, 2015, which is a continuation of U.S.patent application Ser. No. 13/847,319, filed on Mar. 19, 2013, nowissued as U.S. Pat. No. 9,088,992, and claims priority from and thebenefit of Korean Patent Application No. 10-2012-0027938, filed on Mar.19, 2012, which is incorporated by reference for all purposes as iffully set forth herein.

BACKGROUND

Field

The present invention relates to a wireless communication system and,more particularly, to an apparatus and method for controlling In-DeviceCoexistence interference in a wireless communication system.

Discussion of the Background

In order to support an increased transmission capacity, 3rd generationpartnership project (3GPP) long term evolution (LTE) or IEEE 802.16mneeds an extended bandwidth thereof up to 20 MHz or more in recentyears. The bandwidth may need to increase so as to increase thetransmission capacity, but supporting a large bandwidth even when arequired service level is low may cause large power consumption. Withregard to it, technical trade-off may occur.

Also, in recent years, as functions of a single terminal have beenadvanced and complicated, the user can communicate with a plurality ofnetwork systems simultaneously by using only the single terminal anduser convenience has increased. However, when one terminal performscommunication on a plurality of network system bands simultaneously,In-Device Coexistence interference (IDC) may occur. The in-devicecoexistence interference (IDC) means interference when transmission inany one frequency band interferes in reception in another frequencyband. For example, the in-device coexistence interference may occurbetween a Bluetooth system band and a 802.16 system band when oneterminal supports both a Bluetooth system and a 802.16 system.

However, in recent wireless network system, coordinating IDCinterference have not been determined yet. So, a solution to avoid orcontrol in-device coexistence interference is needed.

SUMMARY

One subject to be solved by the present invention is to provide anapparatus and a method for controlling in-device coexistenceinterference.

Another subject to be solved by the present invention is to provide amethod and an apparatus for providing a TDM (Time Division Multiplexing)operation that controls in-device coexistence interference, either byreconfiguring the pattern of the TDM operation, or by autonomouslydenying transmission of an ISM band.

Still another subject to be solved by the present invention is toprovide an apparatus and a method for detecting the occurrence ofin-device coexistence interference with respect to a frequency band thatis configured by a network or a frequency band that is not configured bya network.

According to an example of the present invention, a method forcontrolling in-device coexistence interference through a User Equipmentin a wireless communication system comprises transmitting IDC indicationinformation including an unusable frequency band that is a frequencyband in which performing communication is difficult because of IDCinterference to a evolved NodeB (eNB), receiving Radio Resource Control(RRC) connection reconfiguration including IDC Discontinuous Reception(DRX) configuration reconfiguring DRX relating the unusable frequencyband based on the IDC indication information from the eNB and performingautonomously denial of Industrial Scientific Medical (ISM) transmissionin the unusable frequency band by reconfiguring DRX based on the IDC DRXconfiguration

According to another example of the present invention, a User Equipment(UE) for controlling in-device coexistence interference (IDC) in awireless communication system comprises a transmission unit transmittingIDC indication information including an unusable frequency band that isa frequency band in which performing communication is difficult becauseof IDC interference to a evolved NodeB (eNB), a reception unit receivingRadio Resource Control (RRC) connection reconfiguration including IDCDiscontinuous Reception (DRX) configuration reconfiguring DRX relatingthe unusable frequency band based on the IDC indication information fromthe eNB and an IDC resolution unit performing autonomously denial ofIndustrial Scientific Medical (ISM) transmission in the unusablefrequency band by reconfiguring DRX based on the IDC DRX configuration.

According to yet another example of the present invention, a method forcontrolling in-device coexistence interference (IDC) through aevolved-NodeB (eNB) in a wireless communication system comprisesreceiving IDC indication information including an unusable frequencyband that is a frequency band in which performing communication isdifficult because of IDC interference from a User Equipment (UE),determining IDC Discontinuous Reception (DRX) configurationreconfiguring DRX relating the unusable frequency band based on the IDCindication information, and selecting IDC resolution operationautonomously denying Industrial Scientific Medical (ISM) transmission inthe unusable frequency band and transmitting Radio Resource Control(RRC) connection reconfiguration including the IDC DRX configuration andthe IDC resolution operation to the UE.

According to yet another example of the present invention, aevolved-NodeB (eNB) for controlling in-device coexistence interference(IDC) in a wireless communication system comprises a reception unitreceiving IDC indication information including an unusable frequencyband that is a frequency band in which performing communication isdifficult because of IDC interference from a User Equipment (UE), a IDCresolution selection unit determining IDC Discontinuous Reception (DRX)configuration reconfiguring DRX relating the unusable frequency bandbased on the IDC indication information, and selecting IDC resolutionoperation autonomously denying Industrial Scientific Medical (ISM)transmission in the unusable frequency band and a transmission unittransmitting Radio Resource Control (RRC) connection reconfigurationincluding the IDC DRX configuration and the IDC resolution operation tothe UE.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a wireless communication system according toexemplary embodiments of the present invention.

FIG. 2 is an explanatory diagram describing in-device coexistenceinterference.

FIG. 3 is an example illustrating the in-device coexistence interferencefrom an industrial, scientific and medical (ISM) transmitter to an LTEreceiver.

FIG. 4 is an example in which a band is divided into an ISM band and anLTE band on a frequency band.

FIG. 5 is an explanatory diagram illustrating one example of alleviatingthe in-device coexistence interference by using an FDM scheme accordingto the present invention.

FIG. 6 is an explanatory diagram illustrating another example ofalleviating the in-device coexistence interference by using the FDMscheme according to the present invention.

FIGS. 7 and 8 are explanatory diagrams illustrating one example ofalleviating the in-device coexistence interference by using a powercontrol (PC) scheme according to the present invention.

FIG. 9 is an explanatory diagram illustrating one example of alleviatingthe in-device coexistence interference according to the presentinvention.

FIG. 10 is an explanatory diagram illustrating one example oftransmission/reception timings on time axes in the LTE band and the ISMband using the TDM scheme according to the present invention.

FIG. 11 is a diagram illustrating another example of alleviating thein-device coexistence interference according to the present invention.

FIG. 12 is a diagram illustrating yet another example of alleviating thein-device coexistence interference according to the present invention.

FIG. 13 is a diagram illustrating yet another example of alleviating thein-device coexistence interference according to the present invention.

FIGS. 14 and 15 show an example of a DRX operation according to thepresent invention.

FIG. 16 shows cases where the terminal receives an in-deviceinterference signal.

FIG. 17 is a view illustrating an example of a proximity indicationoperation applied to the present invention.

FIG. 18 is a flowchart illustrating an example of the operation of aterminal and a base station performing in-device coexistenceinterference (hereinafter referred to as “IDC”) control according to thepresent invention.

FIG. 19 is a diagram explaining an example in which the terminalperforms measurement considering IDC or measurement excluding IDCaccording to the present invention.

FIGS. 20A, 20B, and 20C are diagrams illustrating an example of an IDCresolution order indicating that the TDM operation is caused by IDCaccording to the present invention.

FIG. 21 illustrates an example of random access through which theautonomous denial operation according to the present invention isperformed.

FIG. 22 illustrates another example of random access through which theautonomous denial operation according to the present invention isperformed.

FIG. 23 is a flowchart illustrating the operation of a terminal thatcontrols the in-device coexistence interference according to the presentinvention.

FIG. 24 is a flowchart illustrating the operation of a base station thatcontrols in-device coexistence interference according to the presentinvention.

FIG. 25 is an exemplary block diagram of a terminal and a base stationcontrolling in-device coexistence interference according to the presentinvention.

DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS

Hereinafter, in this specification, some exemplary embodiments will bedescribed in detail with reference to the accompanying drawings. Inadding reference numerals to components throughout the drawings, it isto be noted that like reference numerals designate like components eventhough components are shown in different drawings. Further, indescribing the present invention, well-known functions or constructionswill not be described in detail since they may unnecessarily obscure theunderstanding of the present invention.

Further, in describing components of the specification, terms such asfirst, second, A, B, (a), (b), and like may be used. These terms arejust used to discriminate the components from other components and aproperty, an order, or a sequence of the corresponding component is notlimited by the term. It will be understood that when an element issimply referred to as being ‘connected to’ or ‘coupled to’ anotherelement without being ‘directly connected to’ or ‘directly coupled to’another element in the present description, it may be ‘directlyconnected to’ or ‘directly coupled to’ another element or be connectedto or coupled to another element, having the other element interveningthere between.

FIG. 1 illustrates a wireless communication system according toexemplary embodiments of the present invention.

Referring to FIG. 1, the wireless communication system is widely placedin order to provide various communication services including voice,packet, data, and the like, and includes a terminal (also may called asa user equipment (UE)) 10, a base station (called as a evolved NodeB(eNB) or BS) 20, a wireless LAN access point (AP) 30, a globalpositioning system (GPS) 40, and a satellite. Herein, a wireless LAN isa device supporting IEEE 802.11 technology which a wireless standard andthe IEEE 802.11 may be mixed with a WiFi system.

The UE 10 may be positioned in coverage of a plurality of networksincluding a cellular network, a wireless LAN broadcast network, asatellite system, and the like. The UE 10 is provided with a pluralityof wireless transceivers in order to access various networks and variousservices regardless of place and time. For example, a smart phone isprovided with long term evolution (LTE), WiFi Bluetooth transceiver, anda GPS receiver.

Hereinafter, a downlink (DL) indicates communication from the eNB 20 andan uplink (UL) indicates communication from the UE 10 to the eNB 20. Inthe downlink, a transmitter may be a part of the eNB 20 and a receivermay be a part of the UE 10. In the uplink, the transmitter may be a partof the UE 10 and a receiver may be a part of the eNB 20.

The UE 10 may be fixed or have mobility, and may be called other termssuch as a mobile station (MS), a user terminal (UT), a subscriberstation (SS), a mobile terminal (MT), a wireless device, and the like.The eNB 20 indicates a fixed station that communicates with the UE 10and may be called other terms such as a base station (BS), a basetransceiver system (BTS), an access point, a femto base station (BS), arelay, and the like.

Multiple access techniques applied to the wireless communication systemare not limited. Various multiple access techniques such as CDMA (CodeDivision Multiple Access), TDMA (Time Division Multiple Access), FDMA(Frequency Division Multiple Access), OFDMA (Orthogonal FrequencyDivision Multiple Access), SC-FDMA (Single Carrier-FDMA), OFDM-FDMA,OFDM-TDMA, and OFDM-CDMA may be used. In uplink transmission anddownlink transmission, a time division duplex (TDD) scheme in whichtransmission is performed by using different times may be used or afrequency division duplex (FDD) scheme in which transmission isperformed by using different frequencies may be used.

FIG. 2 is an explanatory diagram describing in-device coexistenceinterference.

Referring to FIG. 2, the UE 10 includes an LTE RF 11, a GPS RF 12, and aBluetooth/WiFi RF 13. Transceiving antennas 14, 15, and 16 are connectedto the respective RFs. That is, various types of RFs are closely mountedin one device platform. Herein, transmission power of one RF may be muchlarger than a reception power level into another RF receiver. In thiscase, if an interval in frequency between the RFs is not sufficient anda filtering technique is not supported, a transmission signal of any RFmay cause remarkable interference in a receiver of another RF within thedevice. For example, ‘A’ is an example in which the transmission signalof the LTE RF 11 causes the in-device coexistence interference in theGPS RF 12 and the Bluetooth/WiFi RF 13 and ‘B’ is an example in whichthe transmission signal of the Bluetooth/WiFi RF 13 causes the in-devicecoexistence interference in the LTE RF 11.

FIG. 3 is an example illustrating the in-device coexistence interferencefrom an industrial, scientific and medical (ISM) transmitter to an LTEreceiver. The ISM band indicates a band which may be arbitrarily usedwithout authorizing the use in industrial, scientific, and medicalfields.

Referring to FIG. 3, a band of a signal received by the LTE receiveroverlaps with a band of a transmission signal of the ISM transmitter. Inthis case, the in-device coexistence interference may occur.

FIG. 4 is an example in which a band is divided into an ISM band and anLTE band on a frequency band.

Referring to FIG. 4, a band 40, a band 7, and a band 38 are LTE bands.The band 40 occupies a band in the range of 2300 to 2400 MHz in a TDDmode and the band 7 occupies a band in the range of 2500 to 2570 MHz asthe uplink in an FDD mode. In addition, the band 38 occupies a band inthe range of 2570 to 2620 MHz in the TDD mode. Meanwhile, the ISM bandis used as a WiFi channel and a Bluetooth channel, and occupies a bandin the range of 2400 to 2483.5 MHz. Herein, a condition in which thein-device coexistence interference occurs is illustrated in Table 1below.

TABLE 1 Interference band Pattern of interference Band 40 ISM Tx -> LTETDD DL Rx Band 40 LTE TDD UL Tx -> ISM Rx Band 7 LTE FDD UL Tx -> ISM RxBand 7/13/14 LTE FDD UL Tx -> GPS Rx

Referring to Table 1, a mark of ‘a->b’ in the interference patternillustrates a condition in which a transmitter a causes the in-devicecoexistence interference to a receiver b. Therefore, in the band 40, theISM transmitter causes the in-device coexistence interference to anLTE-band downlink TDD receiver (LTE DL TDD Rx). The in-devicecoexistence interference may be alleviated to some extent by a filteringscheme, but is not sufficient to alleviate the in-device coexistenceinterference. When a frequency division multiplex (FDM) scheme isadditionally applied to the filtering scheme, the in-device coexistenceinterference may be more efficiently alleviated.

FIG. 5 is an explanatory diagram illustrating one example of alleviatingthe in-device coexistence interference by using an FDM scheme accordingto the present invention.

Referring to FIG. 5, the LTE band may be moved so as to prevent the LTEband and the ISM band from overlapping with each other. As a result, ahandover of the terminal is induced from the ISM band. However, to thisend, a method in which legacy measurement or new signaling accuratelytriggers a mobility procedure or a radio link failure (RLF) procedure isrequired. Alternatively, a part which becomes a problem associated withthe ISM in the LTE band may be avoided through a filtering or resourceallocation technique. Alternatively, overlapping interference may beavoided with respect to a case in which LTE carriers are compiledthrough a procedure of reconfiguring a set of used carriers.

FIG. 6 is an explanatory diagram illustrating another example ofalleviating the in-device coexistence interference by using the FDMscheme according to the present invention.

Referring to FIG. 6, the ISM band may be reduced and moved so as to bespaced apart from the LTE band. However, in this scheme, backwardcompatibility problem may occur. In the case of the Bluetooth, thebackward compatibility problem may be resolved due to an adaptivefrequency hopping mechanism to some extent, but in the case of the WiFi,it may be difficult to resolve the backward compatibility problem.

FIGS. 7 and 8 are explanatory diagrams illustrating one example ofalleviating the in-device coexistence interference by using a powercontrol (PC) scheme according to the present invention.

Referring to FIG. 7, the terminal avoids the in-device coexistenceinterference by lowering transmission power of the LTE signal by apredetermined level to improve reception quality of the ISM band andreferring to FIG. 8, the terminal avoids the in-device coexistenceinterference by lowering transmission power of the ISM band by apredetermined level to improve reception quality of the LTE signal.

FIG. 9 is an explanatory diagram illustrating one example of alleviatingthe in-device coexistence interference according to the presentinvention.

Referring to FIG. 9, when a reception time of the LTE signal isprevented from overlapping with a transmission time in the ISM band, thein-device coexistence interference may be avoided. For example, when thesignal in the ISM band is transmitted at t0, the LTE signal is receivedat t1.

FIG. 10 is an explanatory diagram illustrating one example oftransmission/reception timings on time axes in the LTE band and the ISMband using the TDM scheme according to the present invention.

Referring to FIG. 10, the in-device coexistence interference may beavoided without movement between the LTE band and the ISM band by usingthe scheme of FIG. 9.

FIG. 11 is a diagram illustrating another example of alleviating thein-device coexistence interference according to the present invention.

Referring to FIG. 11, a predetermined pattern periodicity interval isdivided into a scheduled period interval and an unscheduled periodinterval to avoid the in-device coexistence interference by the TDMscheme based on discontinuous reception (DRX).

Mutual interference between the LTE and the ISM is avoided by preventingthe LTE from being transmitted within the unscheduled period interval.However, primary LTE transmission such as random access and hybridautomatic repeat request (HARQ) retransmission may be permitted evenwithin the scheduled period interval.

Mutual interference between the LTE and the ISM is avoided by preventingthe ISM from being transmitted and permitting the LTE to be transmittedwithin the scheduled period interval. The primary ISM transmission suchas Beacon or WiFi may be permitted even within the scheduled periodinterval, similarly as the unscheduled period interval.

The LTE transmission may be prevented in order to protect the primaryISM transmission. Special signaling for protecting the primary ISMtransmission such as Beacon may be added. As one example, a period ofthe Beacon signaling and information on a subframe offset may be added.In this case, the subframe offset number and the system frame number maybe determined based on ‘0’. The system frame number may have one of ‘0’to ‘1023’ by the unit of a radio frame in the LTE system. One radioframe is constituted by ten subframes. When the corresponding subframeoffset number and system frame number are known, an accurate frameposition may be known in the corresponding system. The correspondingperiod or offset may be used as information to choose proper DRX periodof DRX offset.

FIG. 12 is a diagram illustrating yet another example of alleviating thein-device coexistence interference according to the present invention.

Referring to FIG. 12, by an autonomously denial scheme, when thein-device coexistence interference occurs in the terminal, transmissionof the LTE is denied in order to protect the reception of the ISM.Herein, a ticked part means that transmission or reception is approvedand a part marked by ‘X’ means that transmission or reception is denied.As an example, even though UL transmission is granted from the basestation, the terminal denies granting not to perform UL transmission inorder to protect the reception of the ISM. Similarly, transmission ofthe ISM is denied in order to protect the reception of the LTE.

FIG. 13 is a diagram illustrating yet another example of alleviating thein-device coexistence interference according to the present invention.

Referring to FIG. 13, by an partially autonomously denial scheme,transmission of the LTE subframe is partially denied based on a PhysicalDownlink Control Channel (PDCCH) in order to protect the reception ofthe ISM.

In principle, a UE denies ISM transmission when receiving PDCCH regionof LTE. However, if downlink resource allocation is not existed insubframe ordered by PDCCH region, ISM transmission is not needed todenied but permitted in the PDCCH region. Here, the PDCCH region means aregion combining a resource region including control information such asresource allocation or grant and a region needed to decode the controlinformation.

In LTE case, PDCCH region means combining the number of OFDM symbol usedfor transmitting PDCCH which is transmitted by Physical Control FormatIndicator Channel (PCFICH) and a region needed to decode PDCCH in theUE.

At this time, the size of the region needed to decode PDCCH in the UEmay be changed based on the UE implementation, but may not be over onesubframe.

In each of PDCCH region (1300, 1310, 1320, 1330, 1340, 1350, 1360,1370), ISM transmission may be denied.

Also, a UE judges whether downlink resource allocation exists innon-PDCCH region (1305, 1315, 1325, 1335, 1345, 1355, 1365, 1375) whichis indicated by each of PDCCH region (1300, 1310, 1320, 1330, 1340,1350, 1360, 1370).

In non-PDCCH region (1315, 1335, 1345, 1355), downlink resourceallocation exists in non-PDCCH region. However, in non-PDCCH region(1305, 1325, 1365, 1375) downlink resource allocation is not existed innon-PDCCH region.

That is, in some of non-PDCCH region, ISM transmission is partiallydenied. In others of non-PDCCH region (1305, 1325, 1365, 1375), ISMtransmission is permitted.

FIGS. 14 and 15 show an example of a DRX operation according to thepresent invention.

Referring to FIG. 14, a DRX cycle 1400 means a cycle in which the DRXoperation is performed, and as one example, there is a long DRX cycle,which is applied in the range between 10 subframes to 2560 subframes,and as another example, there is a short DRX cycle, which is applied inthe range of 2 subframes to 640 subframes. In this case, the short DRXcycle is applied for the DRX operation only while a DRX short cycletimer (drxShortCycleTimer) operates, and in the range falling outside ofthe DRX short cycle timer, the long DRX cycle is applied. Here, thebasic unit of the DRX short cycle timer is one short DRX cycle. That is,if the length of the short DRX cycle is 10, the time becomes“10×drxShortCycleTimer”. At this time, the range of the length of theshort DRX cycle is from 1 to 16.

The active time 1405 means the total time during which a terminal isawake to receive the PDCCH. The active time means the time during whichan on-duration timer 1415 of the terminal operates, or time whichadditionally includes time during which a timer, such as a DRXinactivity timer (drx-InactivityTimer) 1420, a DRX retransmission timer(drx-RetransmissionTimer) 1425, or a MAC contention resolution timer(mac-ContentionResolutionTimer) 1430, is operated.

A non-active time 1410 means time that is not the active time 1405 ofthe DRX cycle 1400.

The timer unit of the DRX timer, such as the on-duration timer 1415, theDRX inactivity timer 1420, or the DRX retransmission timer 1425, is aPDCCH subframe (psf). That is, the DRX timer is signaled or operated ina PDCCH subframe. Here, the PDCCH subframe means a subframe thatincludes the PDCCH. For example, in a TDD configuration, DL subframesand downlink pilot time slot (DwPTS) subframes correspond to PDCCHsubframes. The subframes that are configured with respect to a relaynode (RN) but are not suspended correspond to the PDCCH subframes.

Referring to FIG. 15, while the on-duration timer 1515 is operated inthe DRX cycle 1500, the active time 1505 is configured as long as a DRXcommand MAC CE (DRX command MAC Control Element) 1550 is not received,and if the DRX command MAC CE 1550 is received, the on-duration timer1515 is stopped, and the non-active time 1510 is configured. The lengthof the on-duration timer 1515 is in the range of psf1 to psf200, thatis, in the range from one PDCCH subframe to 200 PDCCH subframes.

The DRX inactivity timer starts when a PDCCH that indicates newtransmission is received, and is stopped when the DRX command MAC CE isreceived.

The DRX retransmission timer starts when data decoding is notsuccessfully performed in the corresponding HARQ procedure in a HARQ RTT(Round Trip Time). If a PDCCH that includes a grant message is receivedwith respect to the corresponding process, the DRX retransmission timeris stopped.

On the other hand, if CQI masking is configured by upper-layersignaling, transmission of CQI, PMI (Precoding Matrix Index), RI (RankIndicator), or PTI (Precoding Type Indicator) is not permitted outsidethe operating range of the on-duration timer. By contrast, if CQImasking is not configured, the transmission of CQI, PMI, RI, or PTI ispermitted in the active time rather than the operating cycle of theon-duration timer. Even outside the operating range of the on-durationtimer, the transmission of the CQI, PMI, RI, or PTI may be permittedduring the operating cycle of another timer, or during the active time,which is determined by a scheduling request operation or a random accessoperation.

In the scheduling request (SR) operation, the DRX active time isconfigured until the corresponding scheduling request is solved in thesituation in which the scheduling request is pending. Here, thesituation in which the scheduling request is pending (or outstanding)means the state in which data to be sent from a terminal to an uplinkexist, but since resources for the corresponding uplink transmissionhave not been granted, the data accumulate without being transmitted.Unless the corresponding resources are not properly granted, thecorresponding pending state is maintained, and the DRX active time isalso maintained. That is, in the situation in which the schedulingrequest is pending, even if the above-described timers have expired, theDRX active time is configured until the corresponding scheduling issolved.

In a random access (RA) operation, the DRX exerts no influence on thetransmission of a preamble or on the reception of a random accessresponse (RAR). The reception of a message 3 (Msg3), which is a messagethat includes a C-RNTI MAC CE (Cell-Radio Network Temporary IdentifierMAC Control Element) or a CCCH SDU (Common Control Channel Service DataUnit) and is transmitted through a UL-SCH (Uplink-Shared Channel), isprotected during the active time by the MAC-contention resolution timer(mac-ContentionResolutionTimer). In the non-contention random access,the active time is extended until the PDCCH constructed by C-RNTI isnewly received after the RAR is received. That is, the PDCCH indicatingthat new transmission is addressed to the C-RNTI of the terminal isreceived in the terminal after the RAR of the preamble is successfullyreceived in the terminal.

Now, according to the present invention, a method for controllingin-device coexistence interference will be described. Hereinafter,operations of reducing, avoiding, or removing interference arerespectively called interference control, interference coordination, orinterference resolution.

Scenarios depicting possible states of on-going in-device coexistenceinterference (IDC) of the terminal are as shown in Table 2.

TABLE 2 Scenario Definition 1 In-device coexistence interference isoccurring in a serving frequency band. 2 Latent in-device coexistenceinterference exists in a serving frequency band (in-device coexistenceinterference is not currently occurring). 3 In-device coexistenceinterference is occurring in a frequency band that is not the servingfrequency band. 4 Latent in-device coexistence interference exists in afrequency band that is not the serving frequency band (in- devicecoexistence interference is not currently occurring).

Each scenario indicates the interference type and the interference statebased on the frequency band. Since the unusable frequency is not relatedto whether the frequency band is the serving frequency band, scenario 1and scenario 3 correspond to in-device coexistence interference.

FIG. 16 shows cases where the terminal receives an in-deviceinterference signal. These cases are classified into seven cases basedon the frequency of occurrence and strength or power of interference.

Referring to FIG. 16, seven cases are classified into four patternsbased on the frequency of occurrence of interference. That is, case 1and case 2 correspond to a continuous pattern, case 3 and case 4correspond to a bursty pattern, case 5 and case 6 correspond to a sparsepattern, and case 7 corresponds to a nonexistent pattern.

The seven cases are classified into three patterns based on the strengthof interference. That is, case 1, case 3, and case 5 correspond to avery strong pattern, case 2, case 4, and case 6 correspond to an enoughweak pattern, and case 7 corresponds to a nonexistent pattern.

As examples, cases where it is determined that in-device coexistenceinterference of the terminal is occurring may be case 1 and case 3. Thecases are cases where the interference is continuous or bursty, and thestrength of interference is very strong.

On the other hand, the case in which in-device coexistence interferenceis not occurring but in-device coexistence interference has occurred,and additionally in which it is possible that in-device coexistenceinterference has changed to the on-going in-device coexistenceinterference is defined as “existence of latent in-device coexistenceinterference”.

As an example, the terminal may determine that case 2, case 4, case 5,and case 6 in Table 2 correspond to the existence of latent in-devicecoexistence interference. As another example, the terminal may determinethat case 5, in which the strength of interference is very strong,corresponds to the existence of latent in-device coexistenceinterference. In the frequency band in which latent in-devicecoexistence interference exists, handover or RRCconfiguration/reconfiguration is not impossible, but the terminal mayperform the measurement.

FIG. 17 is a view illustrating an example of a proximity indicationoperation applied to the present invention. If the terminal detects thatthe terminal approaches a region of a CSG (Closed Subscriber Group) cell(or HeNB) that has a CSG ID that is on the white list of the terminal,the terminal may transmit information (for example, system information)of the CSG cell to a source base station, which transmits and receivesexisting signals, such a procedure being known as “proximityindication”.

Referring to FIG. 17, if the terminal that receives a signal from afirst base station eNB in a macro cell 1700, which is a source basestation, approaches a second base station HeNB in a CSG cell 1710, it ispreferable that the terminal receive the signal from the second basestation, and thus it is required to perform a cell change procedure,that is, handover.

In order for the terminal to perform the cell change procedure moresmoothly, the terminal performs a proximity indication procedure. Forexample, if the terminal approaches a specific region 1720 near the CSGcell, the terminal transmits a proximity indication message to the firstbase station, that is, the source base station. Then, the terminalperforms measurement in accordance with the configuration of the firstbase station, and sets the measurement if there is no measurementconfiguration for a frequency that belongs to the second station. Theterminal reports system information (CGI (Cell Global ID), TAI (TrackingArea ID), and CSG ID) that the terminal has received from the secondbase station, which is the target base station, and system information(PCI (Physical Cell ID) that the terminal possesses to the first basestation, and based on this, the cell change procedure, that is,handover, from the first base station to the second base station isperformed.

Due to the proximity indication operation, it is not necessary for thefirst base station to needlessly request information (PCI, CGI, TAI, andCSG ID) pertaining to a CSG cell that is not adjacent thereto. Further,due to the proximity indication operation, it is not necessary for thefirst base station to perform the measurement configuration required forthe cell change of the corresponding terminal with respect to the CSGcell that is not adjacent thereto. That is, the corresponding terminaldoes not perform the measurement procedure for the cell change to thecorresponding CSG cell.

FIG. 18 is a flowchart illustrating an example of the operation of aterminal and a base station performing in-device coexistenceinterference (hereinafter referred to as “IDC”) control according to thepresent invention.

Referring to FIG. 18, the terminal performs the IDC indication operationthrough transmission of the IDC indication information to the basestation (S1800), and may report the measurement result performed by theterminal. As an example, the terminal is IDC-triggered based on the IDCtriggering condition inside the terminal (or IDC triggering conditionconfigured by the base station) to perform the IDC indication operation.

The IDC indication information (or IDC support information) may beindication information that is discriminated with respect to the TDMoperation or FDM operation or indication information that is integratedwith the TDM operation or FDM operation. The discriminated indicationinformation with respect to the TDM operation and FDM operation may havepriority such that the terminal can request the TDM operation or the FDMoperation, which are IDC resolutions.

Further, the measurement result may be included in the IDC indicationinformation. The measurement result may be used to determine which IDCresolution is more suitable. For example, if the target cell for the FDMoperation has poor channel quality, the base station may select a TDMsolution to solve the IDC problem of the serving cell.

As an example of the IDC indication operation, the terminal may performthe IDC indication operation by transmitting an IDC indication message1850, which is a new message format, to the base station. The IDCindication message 1850 may be configured to perform the IDC indicationonly with respect to a specific frequency band.

The IDC indication message 1850 may include unusable frequency bandinformation. The unusable frequency is a frequency in which IDC isoccurring and thus it is difficult to perform wireless communication. Asan example, even if WiFi of the terminal is not turned on and there isno IDC during an initial LTE connection, the band 40 in the terminalprovided with WiFi is a frequency band that is possibly an unusablefrequency, and thus it is determined to be a frequency band having thepossibility of IDC existence. As another example, the unusable frequencyband may include not only the IDC-occurring frequency band but also thelatent IDC-existing frequency band.

As an example, the IDC indication message 1850 may include all EARFCN(E-UTRA Absolute Radio Frequency Channel Number) values of the unusablefrequency band. Here, EARFCN means the number given to each dividedoperating frequency band of E-UTRA (Evolved-Universal Terrestrial RadioAccess).

As another example, the IDC indication message 1850 may include theEREFCN that corresponds to a bound value of the unusable frequency band.The bound value may be an upper bound value or a lower bound value.

As still another example, the IDC indication message 1850 may includethe EARFCN that corresponds to the lower bound value, and based on this,the IDC indication message may indicate that the frequency band that islarger than the lower bound value is an unusable frequency.

As still another example, the IDC indication message 1850 may includethe EARFCN that corresponds to the upper bound value, and based on this,the IDC indication message may indicate that the frequency band that issmaller than the upper bound value is an unusable frequency. In thiscase, whether the EARFCN included in the IDC indication message 1850 isthe upper bound value or the lower bound value may be predeterminedthrough the 3GPP LTE standards. Further, an indicator indicating whetherthe EARFCN is the upper bound value or the lower bound value (this iscalled a bound type indicator) may be further included in the IDCindication message 1850. As still another example, the type of the boundvalue may be implicitly determined on the basis of the operating bandregion to which the EARFCN included in the IDC indication message 1850belongs.

As still another example, the IDC indication message 1850 may indicatethat the IDC indication message 1850 includes the EARFCN and theoperating band region itself, in which the EARFCN is positioned, is anunusable frequency band.

As still another example, if a plurality of operating bands isinfluenced by the frequency band indicated by the EARFCN, the IDCindication message 1850 may be configured to indicate that all theplurality of operating bands are unusable frequency bands.

If an IDC entering indicator for indicating that the IDC-occurring statestarts is not separately transmitted, and if the frequency band that isrecognized as the usable frequency band by the base station through theIDC indication message 1850 is indicated as an unusable frequency band,the base station may implicitly determine that the IDC-occurring statestarts with respect to the corresponding frequency band.

On the other hand, the IDC indication message 1850 may include TDMpattern information. The TDM pattern may be a DRX cycle, a DRX activecycle, or a DRX subframe offset value.

Further, the IDC indication message 1850 may include the measurementresults obtained through measurement considering IDC or measurementexcluding IDC in accordance with the rules according to which theterminal acquires measurement samples.

FIG. 19 is a diagram explaining an example in which the terminalperforms measurement considering IDC or measurement excluding IDCaccording to the present invention.

Referring to FIG. 19, in a cycle (first cycle) in which IDC occurs in aserving cell or a neighboring cell in which IDC occurs, the terminalobtains the measurement sample that is influenced by IDC, and in a cycle(second cycle) in which IDC does not occur, the terminal obtains ameasurement sample that is not influenced by IDC. Here, the neighboringcell means a cell which is configured through an RRC connectionreconfiguring process and is used as a comparison group of a measurementreport event. Further, the terminal obtains the measurement samples inthe whole cycle (third cycle) regardless of IDC in the serving cell orthe neighboring cell, in which IDC does not occur. In this case, theterminal may obtain the measurement samples in respective cycles of eachsubframe, a fixed subframe, or a certain subframe.

As an example, the measurement sample that is influenced by IDC in thefirst cycle is a measurement sample considering all the influences ofinterference including IDC, interference between cells (for example,interference of co-channel serving and non-serving cells), adjacentchannel interference, and thermal noise, and the measurement sample thatis not influenced by IDC in the second cycle is a measurement samplethat is influenced only by the interference between cells or thermalnoise.

As still another example, in order to remove the influence of theinterference, which occurs due to IDC in the whole cycle in the servingcell or the neighboring cell in which IDC occurs, from the measurementsample, a scheme for preventing the transmission of the ISM with respectto the corresponding measurement sample may be taken. The scheme forpreventing the transmission of the ISM may be a scheme for greatlyreducing the transmission power of the ISM. The great reduction of thetransmission power of the ISM may be, for example, reduction of the IDCinterference strength of the ISM against an LTE reception signal at anLTE reception end to about −20 dB. The scheme for preventing thetransmission of the ISM may be a scheme for postponing the transmissionof the ISM or not transmitting the USM with respect to the correspondingsample. That is, although the transmission of the ISM has been planned,the corresponding transmission may be postponed in time, or may bedenied by the terminal. By this method, the measurement sample, fromwhich the influence of the in-device coexistence interference isremoved, can be obtained over the whole cycle illustrated in FIG. 19.Here, the measurement sample that is not influenced by IDC means themeasurement sample that is influenced only by the interference betweencells or thermal noise.

As still another example, two kinds of measurement samples may beobtained with respect to the first cycle in the serving cell or theneighboring cell in which IDC occurs. The two kinds of measurementsamples may mean the measurement sample including the influence of theIDC interference and the measurement sample from which the influence ofIDC interference is removed. The measurement sample from which theinfluence of IDC interference is removed means the measurement samplehaving a measurement value that is not influenced by the interferencethrough application of the interference-removal technique to thecorresponding sample. As one example of the interference-removaltechnique, there is a method for correcting the SINR value of thecorresponding sample so that it is as high as the strength of the ISMtransmission power at the ISM transmission end.

Here, a first network system means a network system that causes theinterference when IDC occurs. A network system that is affected by theinterference may be a second network system. For example, in the casewhere the ISM reception end is interfered by the LTE uplink, the ISMbecomes the second network system. By contrast, in the case where thereception end of the LTE downlink is interfered with by the ISMtransmission end, the LTE system becomes the second network system.

The measurement sample that is not influenced by IDC in the serving cellor the neighboring cell which is obtained on the basis of the RSRQ isconceptually as described in the following equation 1.

$\begin{matrix}{{MeasurementSample} = \frac{S}{I + N}} & {{Equation}\mspace{14mu} 1}\end{matrix}$

Here, S denotes the strength of a received signal through a neighboringcell in the second network system, I denotes the strength of aninterference signal (for example, interference between cells) that actson the second network system, and N denotes the strength of noise (forexample, thermal noise). That is, the measurement sample means the ratioof the received signal relative to the interference and to the noise.

The measurement sample that is not influenced by IDC in the serving cellor the neighboring cell which is obtained on the basis of the RSRQ isconceptually as shown in the following equation 2.MeasurementSample=S  Equation 2

Here, S denotes the strength of a received signal through a neighboringcell in the second network system. That is, the measurement sample meansthe strength of the received signal in the corresponding neighboringcell of the second network system.

The measurement sample that is influenced by DC in the serving cell orthe neighboring cell, which is obtained on the basis of the RSRQ, isconceptually as shown in the following equation 3.

$\begin{matrix}{{MeasurementSample} = \frac{S}{I + N + I^{\prime}}} & {{Equation}\mspace{14mu} 3}\end{matrix}$

Here, S denotes the strength of a received signal through a serving cellin the second network system, I denotes the strength of an interferencesignal (for example, interference between cells) that acts on the secondnetwork system, N denotes the strength of noise (for example, thermalnoise), and I′ denotes the strength of IDC. That is, the measurementsample means the ratio of the received signal relative to IDC and to theinterference between cells.

The measurement sample that is influenced by IDC in the serving cell orthe neighboring cell which is obtained on the basis of the RSRQ isconceptually as shown in the following equation 4.MeasurementSample=I′,S+I′,S  Equation 4

Here, I′ denotes the strength of IDC, and the measurement sample meansthe strength of the IDC signal in the serving cell. S denotes thestrength of the received signal in the second network system. If it isintended to measure only the influence of IDC, I′ would become theresultant value. If an IDC-mixed value is measured, S+I′ would becomethe resultant value. If the value from which IDC is removed is measured,S would be the resultant value.

On the other hand, an object (for example, terminal) that performs themeasurement may be one object, and a plurality of objects may performthe measurement. For example, an object that performs the measurementconsidering IDC and an object that performs the measurement notconsidering IDC may independently exist.

Here, the measurement result means a value finally calculated throughfiltering of the measurement samples. For example, in the case of theLTE, the final values of RSRP (Reference Signal Received Power) and RSRQ(Reference Signal Received Quality), which are generated through L1filtering and L3 filtering, are the measurement result that is reportedto the base station. However, the measurement result considering the maybe the result of filtering only the measurement samples including IDC orthe result of filtering both the measurement samples including IDC andthe measurement samples that do not include IDC. Further, themeasurement result from which IDC is removed may be the result offiltering only the measurement samples that do not include IDC or theresult of filtering the measurement samples from which IDC is removed bythe interference-removal technique among the measurement samplesincluding IDC in addition to the measurement samples that do not includeIDC.

As an example, the measurement result included in the IDC indicationmessage 1850 may be the measurement result from which IDC is removed. Asanother example, the measurement result included in the IDC indicationmessage 1850 may be the measurement result considering IDC. As stillanother example, the measurement result included in the IDC indicationmessage 1850 may include both the measurement result from which IDC isremoved and the measurement result considering IDC. As still anotherexample, the measurement result included in the IDC indication message1850 may include both the strength of IDC and the measurement resultfrom which IDC is removed. As still another example, the measurementresult included in the IDC indication message 1850 may include both thestrength of IDC and the measurement result considering IDC. As stillanother example, the measurement result included in the IDC indicationmessage 1850 may include all of the strength of IDC, the activity ofIDC, and the measurement result from which IDC is removed. Here, theactivity of IDC means an index of how often IDC occurs over time. As anexample, the activity of IDC may be defined as the ratio of thesubframes in which IDC does not occur to the subframes in which IDCoccurs. As a possible implementation example, there may be a scheme forobtaining an average value based on each subframe weight value. As stillanother example, the measurement result included in the IDC indicationmessage 1850 may include all of the strength of IDC, the activity ofIDC, and the measurement result considering the IDC.

As another example of the IDC indication operation in step S1800, theterminal may perform the IDC indication operation by transmitting ameasurement report message 1855 to the base station. The measurementreport message 1855 may be configured to perform the IDC indication onlywith respect to a specific frequency band. The measurement reportmessage 1855 may include not only the measurement result but alsounusable frequency information or TDM pattern information.

As an example, the measurement report message 1855 may include allEARFCN values of the unusable frequency band.

As another example, the measurement report message 1855 may include theEARFCN corresponding to the bound value of the unusable frequency band.The bound value may be the upper bound value or the lower bound value.

As still another example, the measurement report message 1855 mayinclude the EARFCN that corresponds to the lower bound value, and basedon this, the measurement report message may indicate that the frequencyband that is larger than the lower bound value is an unusable frequency.Further, the measurement report message 1855 may include the EARFCN thatcorresponds to the upper bound value, and based on this, the measurementreport message may indicate that the frequency band that is smaller thanthe upper bound value is an unusable frequency. In this case, whetherthe EARFCN included in the measurement report message 1855 is the upperbound value or the lower bound value may be predetermined through the3GPP LTE standards. Further, an indicator indicating whether the EARFCNis the upper bound value or the lower bound value (a bound typeindicator) may be further included in the measurement report message1855. Further, the type of the bound value may be implicitly determinedbased on the number of the operating band to which the EARFCN includedin the measurement report message 1855 belongs.

As still another example, the measurement report message 1855 mayinclude the EARFCN and the EARFCN may be configured to indicate that theoperating band region itself, in which the EARFCN is positioned, is anunusable frequency band. As still another example, if a plurality ofoperating bands is influenced by the frequency band indicated by theEARFCN, the measurement report message 1855 may be configured toindicate that all the plurality of operating bands are unusablefrequency bands.

If an IDC entering indicator for indicating that the IDC-occurring statestarts is not separately transmitted, and if the frequency band that isrecognized as an usable frequency band by the base station through themeasurement report message 1855 is indicated as an unusable frequencyband, the base station may implicitly determine that the IDC-occurringstate starts with respect to the corresponding frequency band.

On the other hand, the measurement report message 1855 may include TDMpattern information. The TDM pattern may be a DRX cycle, a DRX activecycle, or a DRX subframe offset value.

One or both of the unusable frequency information and the TDM patterninformation may be included in the measurement report message 1855. Ifboth the unusable frequency information and the TDM pattern informationare provided, the unusable frequency information and the TDM patterninformation are signaled in pairs.

Further, the measurement report message 1855 may include the measurementresults obtained through the measurement in accordance with the rulesaccording to which the terminal acquires measurement samples. In thiscase, the terminal may perform measurement considering IDC ormeasurement excluding IDC. As an example, the measurement resultincluded in the measurement report message 1855 may be the measurementresult from which IDC is removed. As another example, the measurementresult included in the measurement report message 1855 may be themeasurement result considering IDC. As still another example, themeasurement result included in the measurement report message 1855 mayinclude both the measurement result from which IDC is removed and themeasurement result considering IDC. As still another example, themeasurement result included in the measurement report message 1855 mayinclude both the strength of IDC and the measurement result from whichIDC is removed. As still another example, the measurement resultincluded in the measurement report message 1855 may include both thestrength of IDC and the measurement result considering IDC. As stillanother example, the measurement result included in the measurementreport message 1855 may include all of the strength of IDC, the activityof IDC, and the measurement result from which IDC is removed. As stillanother example, the measurement result included in the measurementreport message 1855 may include all of the strength of IDC, the activityof IDC, and the measurement result considering the IDC.

As still another example of the IDC indication operation in step S1800,the terminal may perform the IDC indication operation by transmitting aproximity indication message 1860, which is used for the proximityindication operation, to the base station. The proximity indicationmessage 1860 may be configured to perform the IDC indication operationonly with respect to a specific frequency band.

Further, an identifier, which discriminates the proximity indicationmessage 1860 for the existing CSG (Closed Subscriber Group) and theproximity indication message 1860 including IDC indication information,may be further included in the proximity indication message 1860.

In the case in which the IDC indication information is included in theproximity indication message 1860, the proximity indication message 1860may include the unusable frequency information or the TDM pattern.

As an example in which the proximity indication message 1860 includesthe unusable frequency information, the proximity indication message1860 may include all the EARFCN values of the unusable frequency band.

As another example, the proximity indication message 1860 may includethe EARFCN corresponding to the boundary value of the unusable frequencyband. The bound value may be the upper bound value or the lower boundvalue.

As still another example, the proximity indication message 1860 mayinclude the EARFCN that corresponds to the lower bound value, and basedon this, the proximity indication message may indicate that a frequencyband that is larger than the lower bound value is an unusable frequency.Further, the proximity indication message 1860 may include the EARFCNthat corresponds to the upper bound value, and based on this, theproximity indication message may indicate that a frequency band that issmaller than the upper bound value is an unusable frequency. In thiscase, whether the EARFCN included in the proximity indication message1860 is the upper bound value or the lower bound value may bepredetermined through the 3GPP LTE standards. Further, an indicatorindicating whether the EARFCN is the upper bound value or the lowerbound value (a bound type indicator) may be further included in theproximity indication message 1860. Further, the type of the bound valuemay be implicitly determined based on the number of the operating bandto which the EARCN included in the proximity indication message 1860belongs.

As still another example, the proximity indication message 1860 mayinclude the EARFCN, and the EARFCN may indicate that the operating bandregion itself, in which the EARFCN is positioned, is an unusablefrequency band.

As still another example, if a plurality of operating bands isinfluenced by the frequency band indicated by the EARFCN, the proximityindication message 1860 may be configured to indicate that all theplurality of operating bands are unusable frequency bands.

If an IDC entering indicator for indicating that the IDC-occurring statestarts is not separately transmitted, and if a frequency band that isrecognized as an usable frequency band by the base station through theproximity indication message 1860 is indicated as an unusable frequencyband, the base station may determine that the IDC-occurring state startswith respect to the corresponding frequency band.

On the other hand, the proximity indication message 1860 may include TDMpattern information. The TDM pattern may be a DRX cycle, a DRX activecycle, or a DRX subframe offset value.

One or both of the unusable frequency information and the TDM patterninformation may be included in the proximity indication message 1860. Ifboth the unusable frequency information and the TDM pattern informationare provided, the unusable frequency information and the TDM patterninformation are signaled in pairs.

To follow the step S1800, the base station selects the most suitable IDCresolution (or coordination scheme) based on the IDC indicationinformation received from the terminal (S1805). In this case, the IDCresolution may be an FDM operation or a TDM operation. The FDM operationor the TDM operation may be an operation as depicted in FIGS. 5 to 13.As an example, if it is determined that there is no problem in theusable frequency band through the load balance and handover is notgreatly influenced (for example, if the RSRP or RSRQ value of thecorresponding frequency band is sufficiently large) when a problemoccurs in the frequency band through which the base station providesservice, the FDM operation may be performed, and otherwise, the TDMoperation may be performed in the serving cell.

The TDM operation based on the DRX in the case where the IDC resolutionis the TDM operation according to the present invention will bedescribed.

The base station transmits an IDC resolution order to the terminal basedon the IDC resolution method (S1810). For example, the IDC resolutionorder may be transmitted through an RRC connection reconfigurationmessage.

As an example, the IDC resolution order may include an operation of aprohibition timer, which prohibits transmission of the IDC indicationmessage 1850, the measurement report message 1855, or the proximityindication message 1860 for a predetermined time.

As still another example, if the determined IDC resolution order is theTDM operation, a specific DRX pattern may be transmitted through the RRCconnection reconfiguration message.

As still another example, if the determined IDC resolution order is theTDM operation, an indicator, which indicates that the DRX pattern iscaused by the IDC, may be transmitted together with the specific DRXpattern through the RRC connection reconfiguration message, and this iscalled a TDM IDC indicator. Hereinafter, this will be described indetail. The measurement that is performed by the terminal in accordancewith the indication of the TDM IDC indicator may be changed so that itis different from the previous one.

As still another example, if the determined IDC resolution operation isthe TDM operation, HARQ retransmission in the LTE band may be denied forhandling of a beacon while the signal is transmitted in the ISM band.That is, the start of the IDC resolution order may be instructed throughthe IDC indication message (or the measurement report message or theproximity indication message).

On the other hand, if the IDC resolution operation that is determined bythe base station on the basis of the IDC indication information is thesame as the IDC resolution operation that exists and is in progress, theIDC resolution ordering process may be omitted.

FIGS. 20A to 20C are diagrams illustrating an example of an IDCresolution order indicating that the TDM operation is caused by IDCaccording to the present invention.

FIGS. 20A to 20C are related to a method for directly signaling anexplicit value of the DRX pattern through the base station. In addition,there is a method (not illustrated in the drawing) for transmitting onlythe TDM IDC indicator and configuring an implicit value in accordancewith the internal configuration of the terminal and the base station.

Referring to FIG. 20A, through the existing RRC connectionreconfiguration 2000, the base station transmits a MAC mainconfiguration information element 2002, which includes a DRXconfiguration 2004.

According to the present invention, through new RRC connectionreconfiguration 2010 according to the IDC resolution order (S1810), thebase station may transmit a MAC main configuration information element2012, in which a DRX IDC configuration 2014 and a TDM IDC indicator 2015are included.

The DRX IDC configuration information 2014 may include configurationinformation about a DRX inactivity timer 2016, a DRX retransmissiontimer 2017, and a DRX short cycle timer 2018. In this case, the DRXinactivity timer 2016 may be configured as psf0, the DRX retransmissiontimer 2017 may be configured as psf0, and the DRX short cycle timer 2018may be configured as a value in the range from 1 to 16, or a new valuethat is larger. The new value may be configured as a very large value,such as 2560, or an infinite value, and thus the DRX short cycle timermay be configured to be stopped only through the RRC connectionreconfiguration or release.

If the DRX inactivity timer is configured as psf0, the DRX inactivitytimer starts through reception of the PDCCH, which indicates the newtransmission, and then immediately expires. Accordingly, the DRXinactivity timer does not exert an influence on the active time. If theon-duration timer has expired, the active time is not maintained by theinfluence of the DRX inactivity timer even if a PDCCH that indicates thenew transmission is received.

If the DRX retransmission timer is configured as psf0, the DRXretransmission timer does not exert an influence on the active time dueto failure of data decoding in the HARQ procedure. If the on-durationtimer has expired, the active time is not maintained by the value of theDRX retransmission timer even if data decoding fails in the HARQprocedure.

The terminal reconfigures the values received through the DRX IDCconfiguration 2014 and the TDM IDC indicator 2015 as the value set bythe existing DRX configuration 2004.

Further, CQI masking is set up, and the non-scheduled cycle (forexample, the ISM transmission cycle in the TDM operation) may beprotected. For example, a parameter “Cqi-Mask” of a CQI reportconfiguration information element (CQI-ReportConfig information element)may be configured as “setup”.

The following Table 3 shows an example of the MAC main configurationinformation elements according to the present invention.

TABLE 3  -- ASN1START  MAC-MainConfig ::= SEQUENCE {  drx-Config DRX-Config OPTIONAL, -- Need ON   [[mac-MainConfig-v11xSEQUENCE {    idcTdm ENUMERATED {setup}  OPTIONAL, -- Need OR   drx-Config-Idc DRX-Config-Idc  OPTIONAL, -- Cond idcTdm   }  OPTIONAL -- Need ON   ]]   ...  }  DRX-Config-Idc ::= CHOICE {  release     NULL,   setup         SEQUENCE {    drx-InactivityTimer ENUMERATED {psf0},    drx-RetransmissionTimer  ENUMERATED {psf0},   shortDRX  SEQUENCE {     shortDRX-Cycle   ENUMERATED  {   sf2, sf5,sf8 sf10, sf16, sf20, sf32, sf40, sf64, sf80, sf128, sf160, sf256,sf320, sf512, sf640},     drxShortCycleTimer   INTEGER (1..2560)   }     OPTIONAL       -- Need OR   }  }  -- ASN1STOP

Here, the MAC main configuration control element is MAC_MainConfig, theDRX configuration is drx-Config, the MAC main configuration controlelement according to new RRC connection reconfiguration ismac-MainConfig-vllxx, the TDM IDC indicator is idcTdm, the DRX IDCconfiguration is drx-Config-Idc, the DRX inactivity timer isdrx-InactivityTimer, the DRX retransmission timer isdrx-RetransissionTimer, and the DRX short cycle timer isdrxShortCycleTimer. Further, a new value is configured as 2560.

Referring to FIG. 20B, through the existing RRC connectionreconfiguration 2030, the base station transmits a MAC mainconfiguration information element 2032, in which a DRX configuration2034 is included.

According to the present invention, through new RRC connectionreconfiguration 2040 according to the IDC resolution order (S1810), thebase station may transmit a MAC main configuration information element2012, in which not only the existing DRX configuration 2044 but also aDRX IDC configuration 2046 and a TDM IDC indicator 2047 are included.

The DRX IDC configuration information 2046 may include configurationinformation about a DRX inactivity timer 2048, a DRX retransmissiontimer 2049, and a DRX short cycle timer 2050. In this case, the DRXinactivity timer 2048 may be configured as psf0, the DRX retransmissiontimer 2049 may be configured as psf0, and the DRX short cycle timer 2050may be configured as a value in the range from 1 to 16 or a new valuethat is larger. The new value may be configured as a very large value,such as 2560, or an infinite value, and thus the DRX short cycle timermay be configured to be stopped only through the RRC connectionreconfiguration or release.

The terminal reconfigures the values configured by the existing DRXconfiguration 2034 with respect to changed values among values receivedthrough the DRX configuration 2044, which is not related to IDC, andvalues received through the DRX IDC configuration 2046 and the TDM IDCindicator 2047. That is, with respect to the DRX inactivity timer 2048,the DRX retransmission timer 2049, and the DRX short cycle timer 2050, anew value for IDC is signaled in addition to the existing DRXconfiguration value, and IDC-related values can be selected by theterminal.

Further, CQI masking is set up, and the non-scheduled cycle (forexample, the ISM transmission cycle in the TDM operation) may beprotected. For example, a parameter “Cqi-Mask” of a CQI reportconfiguration information element may be configured as “setup”.

The following Table 4 shows another example of the MAC mainconfiguration information elements according to the present invention.

TABLE 4  -- ASN1START  MAC-MainConfig ::=  SEQUENCE {   drx-Config     DRX-Config OPTIONAL, -- Need ON   [[mac-MainConfig-v11xx  SEQUENCE{   drx-Config      DRX-Config OPTIONAL, -- Need ON    idcTdm       ENUMERATED {setup}  OPTIONAL, -- Need OR    drx-Config-Idc    DRX-Config-Idc OPTIONAL, -- Cond idcTdm    }   OPTIONAL -- Need ON  ]]   ...  }  DRX-Config-Idc ::= CHOICE {   release      NULL,  setup      SEQUENCE {    drx-InactivityTimer    ENUMERATED {psf0},   drx-RetransmissionTimer ENUMERATED {psf0},    shortDRX     SEQUENCE {    shortDRX-Cycle     ENUMERATED  {                sf2, sf5, sf8, sf10,sf16, sf20, sf32, sf40, sf64, sf80, sf128, sf160, sf256, sf320, sf512,sf640},     drxShortCycleTimer   INTEGER (1..2560)    } OPTIONAL         -- Need OR   }  }  -- ASN1STOP

Here, the MAC main configuration control element is MAC_MainConfig, theDRX configuration is drx-Config, the MAC main configuration controlelement according to new RRC connection reconfiguration ismac-MainConfig-vllxx, the TDM IDC indicator is idcTdm, the DRX IDCconfiguration is drx-Config-Idc, the DRX inactivity timer isdrx-InactivityTimer, the DRX retransmission timer isdrx-RetransissionTimer, and the DRX short cycle timer isdrxShortCycleTimer.

Referring to FIG. 20C, a MAC main configuration information element2062, which the base station transmits through the existing RRCconnection reconfiguration 2060, includes new DRX configuration 2064,which includes the DRX IDC configuration according to the presentinvention. That is, the new DRX configuration 2064 includesconfiguration of the DRX inactivity timer, the DRX retransmission timer,and the DRX short cycle timer, and the MAC main configurationinformation element 2062 including the new DRX configuration 2064 is anew information element according to the present invention.

According to the present invention, through new RRC connectionreconfiguration 2070 according to the IDC resolution order (S1810), thebase station may transmit a MAC main configuration information element2072, in which a new DRX configuration 2074 and a TDM IDC indicator 2075are included.

In accordance with the new DRX configuration information 2074, the DRXinactivity timer 2076 may be configured as psf0, the DRX retransmissiontimer 2077 may be configured as psf0, and the DRX short cycle timer 2078may be configured as a new value. The new value may be configured as avery large value, such as 2560, or an infinite value, and thus the DRXshort cycle timer may be configured to be stopped only through the RRCconnection reconfiguration or release.

The terminal reconfigures the values configured by the existing DRXconfiguration 2064 as the values received through the new DRXconfiguration 2074 and the TDM IDC indicator 2075.

Further, CQI masking is set up, and the non-scheduled cycle (forexample, the ISM transmission cycle in the TDM operation) may beprotected. For example, a parameter “Cqi-Mask” of a CQI reportconfiguration information element may be configured as “setup”.

The following Table 5 shows another example of the MAC mainconfiguration information elements according to the present invention.

TABLE 5  -- ASN1START  MAC-MainConfig ::=   SEQUENCE {  drx-Config-version11.xxx DRX-Config-version11.xxx  OPTIONAL, -- NeedON   idcTdm         ENUMERATED {setup}  OPTIONAL, -- Need OR   ...  } DRX-Config-version11.xxx ::= CHOICE {   release        NULL,  setup        SEQUENCE {   onDurationTimer        ENUMERATED {                 psf1, psf2, psf3, psf4, psf5, psf6, psf8, psf10, psf20,psf30, psf40, psf50, psf60, psf80, psf100, psf200},   drx-InactivityTimer      ENUMERATED {                  psf1, psf2,psf3, psf4, psf5, psf6, psf8, psf10, psf20, psf30, psf40, psf50, psf60,psf80, psf100, psf200, psf300, psf500, psf750, psf1280, psf1920,psf2560, psf0-v1020, spare9, spare8, spare7, spare6, spare5, spare4,spare3, spare2, spare1},    drx-RetransmissionTimer ENUMERATED {               psf1, psf2, psf4, psf6, psf8, psf16, psf24,psf33,psf0-v11xx},   longDRX-CycleStartOffset  CHOICE {     sf10INTEGER(0..9),     sf20 INTEGER(0..19),     sf32 INTEGER(0..31),    sf40 INTEGER(0..39),     sf64 INTEGER(0..63),     sf30INTEGER(0..79),     sf128 INTEGER(0..127),     sf160 INTEGER(0..159),    sf256 INTEGER(0..255),     sf320 INTEGER(0..319),     sf512INTEGER(0..511),     sf640 INTEGER(0..639),     sf1024 INTEGER(0..1023),    sf1280 INTEGER(0..1279),     sf2048 INTEGER(0..2047),     sf2560INTEGER(0..2559)    },    shortDRX       SEQUENCE {     shortDRX-Cycle     ENUMERATED  {                 sf2, sf5, sfi3, sf10, sf16, sf20,sf32, sf40, sf64, sf80, sf128, sf160, sf256, sf320, sf512, sf640},    drxShortCycleTimer     INTEGER (1..16)    drxShortCycleTimerIdc   infinite (or Newvalue) - Need OR    }   OPTIONAL                  -- Need OR   }  }

Here, the MAC main configuration control element is MAC_MainConfig, theDRX configuration is drx-Config, the new DRX configuration isdrx-Config-version11.xxx, the MAC main configuration control elementaccording to the new RRC connection reconfiguration ismac-MainConfig-vllxx, the TDM IDC indicator is idcTdm, the on-durationtimer is on-DurationTimer, the DRX inactivity timer isdrx-InactivityTimer, the DRX retransmission timer isdrx-RetransissionTimer, the short DRX cycle is shortDRX-Cycle, and theDRX short cycle timer is drxShortCycleTimer. Further, the DRX shortcycle timer for IDC is drxShortCycleTimerIdc, and the value thereof maybe an infinite value or a new value.

Now, a method (not illustrated in the drawing) for transmitting only theTDM IDC indicator and configuring an implicit value in accordance withthe internal configuration of the terminal and the base station will bedescribed.

In this case, the MAC main configuration information element that thebase station transmits to the terminal includes a TDM IDC indicator. Ifthe TDM IDC indicator is received, the terminal itself may configure theDRX inactivity timer as psf0, configure the DRX retransmission timer aspsf0, and configure the DRX short cycle timer as a new value. The newvalue may be configured as a very large value, such as 2560, or aninfinite value, and thus the DRX short cycle timer may be configured tobe stopped only through the RRC connection reconfiguration or release.

The values (psf0 and 2560) presented in the signaling technique areexamples, and other values may be configured on the basis of the TDM IDCindicator. However, the base station does not transmit accurate values,but the system configures the values in advance. Accordingly, the valuesare already known in the terminal and the base station through separatesignaling. Through the reception of the TDM IDC indicator, the knownvalues are configured by the terminal.

Further, the CQI masking is set up by the TDM IDC indicator, and thenon-scheduled cycle (for example, the ISM transmission cycle in the TDMoperation) may be protected. For example, a parameter “Cqi-Mask” of aCQI report configuration information element (CQI-ReportConfiginformation element) may be configured as “setup”.

To follow the step S1810, the terminal performs the IDC resolutionoperation (S1815), and performs the TDM operation as the IDC resolutionoperation based on the IDC resolution order (S1810). As an example ofthe TDM operation, a scheduling request operation or the random accessoperation may be performed. The operation of the DRX timer and CQI, PMI,PTI, or RI follow the values configured according to the MAC mainconfiguration information elements 2010, 2040, and 2070 transmitted inthe step S1810.

As an example, in transmitting the scheduling request in thenon-scheduled cycle as the scheduling request operation, an autonomousdenial operation, as illustrated in FIG. 12 or 13, may be performed inaccordance with the determination of the terminal. In the terminal, LTEQoS (Quality of Service) and ISM QoS are compared with each other, andthe autonomous denial operation may be configured to be performed aslong as the LTE QoS does not decrease below a predetermined value.

As another example, in the scheduling request operation, even if ascheduling request is pending, the non-scheduled cycle may start. Thatis, in the case where the non-scheduled cycle starts in accordance withthe operation of other timers even if a scheduling request is pending,the scheduled cycle, that is, the DRX active time, is not maintained inthe DRX operation used for IDC. Accordingly, if a scheduling request ispending in the DRX operation, which is not for the purpose of IDC, theoperation is performed in the active time when the reception of thePDCCH is possible for the corresponding time regardless of the operationof other timers. However, in the DRX operation that is for the purposeof IDC, the operation is performed in the non-active time, during whichthe reception of the PDCCH is not performed, even if the schedulingrequest is pending.

As still another example, in changing the scheduling request operation,the operation of a scheduling request pending counter SR_COUNTER may bechanged. Here, the scheduling request pending counter monitors thepending state of a scheduling request every transmit time interval(TTI), and if a scheduling request is pending, the scheduling requestpending counter increments by 1. If the count value of the schedulingrequest pending counter exceeds a predetermined counter upper limitvalue (dsr-TransMax), the random access operation starts for the purposeof the scheduling request. However, since in the DRX operation used forthe purpose of IDC, the DRX active time may not start even if ascheduling request is pending, the counter increment operation in theDRX non-active time, that is, in the non-scheduled cycle, may bereserved with respect to the corresponding counter. That is, during theDRX non-active time, the counter operation is reserved even if ascheduling request is pending, and the counter may not increment at eachtransmit time interval. When the DRX active time is resumed, thecorresponding counter increments again.

As still another example, in the scheduling request operation, thescheduling request may be permitted even during the DRX non-active time.That is, although the base station is unable to grant the terminaluplink resources for the scheduling request during the correspondingnon-active time, the terminal can make the corresponding request withrespect to the base station for the purpose of indicating the necessityof the uplink transmission. The base station may grant the uplinktransmission resources through the next active time in response to thecorresponding request, or may change the pattern of the DRX for thepurpose of IDC. As an example, in order to lengthen the scheduled cyclefor LTE transmission of the corresponding terminal, a longer DRXon-duration timer may be configured.

In the random access operation, in the terminal that has performed thepreamble transmission, the LTE QoS and the ISM QoS are compared witheach other, and the autonomous denial operation may be performed as longas the LTE QoS does not decrease too much.

FIG. 21 illustrates an example of random access through which theautonomous denial operation according to the present invention isperformed.

Referring to FIG. 21, after the terminal transmits a preamble to thebase station (S2100), the base station transmits a RAR to the terminalin response thereto (S2105).

In this case, if a RAR window region, which is determined by the RARwindow size (ra-ResponseWindowSize) 2150, exists outside the on-durationtimer operation region, ISM transmission may be autonomously denied andtemporarily postponed during the whole of the corresponding RAR windowregion (S2110).

FIG. 22 illustrates another example of random access through which theautonomous denial operation according to the present invention isperformed.

Referring to FIG. 22, after the terminal transmits a preamble to thebase station (S2200), the base station transmits a RAR to the terminalin response thereto (S2205).

In this case, if a RAR window size (ra-ResponseWindowSize) 2250 is foursubframes and a RAR window region, which is determined by the RAR windowsize, exists outside the on-duration timer operation region, partial ISMtransmission may be autonomously denied with respect to the RAR windowregion, and the partial ISM transmission may be postponed (S2210).

In principle, the autonomous denial of the ISM transmission is performedwith respect to PDCCH regions 2260, 2270, 2280, and 2290, and the LTEreception of the terminal is protected.

It is determined whether to deny the ISM transmission with respect tonon-PDCCH regions 2265, 2285, and 2295 based on the PDCCH regions 2260,2270, 2280, and 2290.

If downlink resource allocation does not exist in the non-PDCCH regions2265, 2275, 2285, and 2295, which are indicated by PDCCHs 2260, 2280,and 2290 of the subframes, it is not necessary to deny the ISMtransmission, and thus the ISM transmission is permitted.

If downlink resource allocation exists in the non-PDCCH region 2275,which is indicated by the PDCCH 2270 of the subframes, IDC may occurthrough the ISM transmission, and thus the ISM transmission is denied.

If the PDCCH is a PDCCH that is not scrambled by a RA-RNTI (RandomAccess-Radio Network Temporary Identifier) that indicates the existenceof a RAR MAC CE (RAR MAC Control Element), it would not be necessary toperform ISM autonomous denial with respect not only to the correspondingPDCCH but also to the non-PDCCH region indicated by the PDCCH.

However, with respect to the subframe region, which is called by thePDCCH region that is scrambled by the RA-RNTI indicating the existenceof the RAR MAC CE, the ISM autonomous denial may be performed for theRAR reception. That is, if the PDCCH 2270 is scrambled by the RA-RNTI,ISM autonomous denial may be performed with respect to the region of thePDCCH 2275 of the subframe region that is called by the correspondingPDCCH 2270.

FIG. 23 is a flowchart illustrating the operation of a terminal thatcontrols the in-device coexistence interference according to the presentinvention.

Referring to FIG. 23, the terminal performs the IDC indication operationthrough transmission of the IDC indication information to the basestation (S2300). The IDC indication information (or IDC supportinformation) may be indication information that is discriminated withrespect to the TDM operation or the FDM operation, or indicationinformation that is integrated with the TDM operation or the FDMoperation. In this case, the indication information discriminated withrespect to the TDM operation or the FDM operation may have prioritywhich the terminal can request between the TDM operation and the FDMoperation, which are IDC resolutions on the terminal side.

Further, the measurement result may be included in the IDC indicationinformation. The measurement result may be used to determine which IDCresolution is more suitable. For example, if the target cell for the FDMoperation has poor channel quality, the base station may select the TDMsolution to solve the IDC problem of the serving cell.

The terminal may perform the IDC indication operation by transmitting anIDC indication message, a measurement report message, or a proximityindication message, which is a new message format, to the base station.The IDC indication message (measurement report message or proximityindication message) may include unusable frequency band information. Asan example, the IDC indication message (measurement report message orproximity indication message) may include an EARFCN value of theunusable frequency band.

On the other hand, the IDC indication message (measurement reportmessage or proximity indication message) may include TDM patterninformation. The TDM pattern may be a DRX cycle, a DRX active cycle, ora DRX subframe offset value.

Further, the IDC indication message (measurement report message orproximity indication message) may include the result of measurementconsidering IDC or the result of measurement excluding IDC in accordancewith the rules according to which the terminal acquires the measurementsamples. The measurement results included in the IDC indication message(measurement report message or proximity indication message) may includeat least one of the IDC strength, the IDC activity, the measurementresult considering IDC, and the measurement result excluding IDC.

The terminal receives the most suitable IDC resolution order, selectedbased on the IDC indication information, from the base station (S2305).For example, the IDC resolution order may be transmitted through the RRCconnection reconfiguration message.

As an example, if the determined IDC resolution order is the TDMoperation, the terminal may receive the TDM IDC indicator, indicatingthat the DRX pattern is caused by IDC together with a specific DRXpattern, through the RRC connection reconfiguration message.

As another example, if the determined IDC resolution order is the TDMoperation, the terminal may receive the DRX configuration information,such as a specific DRX pattern, through the RRC connectionreconfiguration message.

As still another example, if the determined IDC resolution order is theTDM operation, the terminal may deny the HARQ retransmission in the LTEband for the handling of a beacon while the signal is transmitted in theISM band. That is, the start of the IDC resolution order may beinstructed through the IDC indication message (or measurement reportmessage or proximity indication message).

As still another example, the IDC resolution order may include theoperation of a prohibition timer that prohibits transmission of the IDCindication message (measurement report message or proximity indicationmessage) for a predetermined time.

On the other hand, if the IDC resolution operation that the base stationdetermines based on the IDC indication information is the same as theIDC resolution operation that is currently in progress, the IDCresolution order procedure may be omitted.

On the other hand, the terminal may directly receive DRX configurationinformation including an accurate value for the DRX pattern from thebase station. Further, although the terminal receives only the TDM IDCindicator, an autonomous DRX pattern value may be configured dependingon the configuration in the terminal.

As an example (embodiment 1), the terminal may receive a MAC mainconfiguration information element in which the DRX IDC configuration andthe TDM IDC indicator are included. The DRX IDC configuration mayinclude configuration information on the DRX inactivity timer, the DRXretransmission timer, and the DRX short cycle timer. As shown in Table 3above, the DRX inactivity timer may be configured as psf0, the DRXretransmission timer may be configured as psf0, and the DRX short cycletimer may be configured as a value in the range of 1 to 16, or a newvalue that is larger. The new value may be configured as a very largevalue, such as 2560, or an infinite value, and thus the DRX short cycletimer may be configured to be stopped only through the RRC connectionreconfiguration or release.

If the DRX inactivity timer is configured as psf0, the DRX inactivitytimer starts through the reception of the PDCCH that indicates the newtransmission and then immediately expires. Accordingly, the DRXinactivity timer does not have any influence on the active time. If theon-duration timer has expired, the active time is not maintained by theinfluence of the DRX inactivity timer even if a PDCCH that indicates anew transmission is received.

If the DRX retransmission timer is configured as psf0, the DRXretransmission timer does not exert an influence on the active time dueto failure of data decoding in the HARQ procedure. If the on-durationtimer has expired, the active time is not maintained by the value of theDRX retransmission timer even if data decoding fails in the HARQprocedure.

In this case, the values that the terminal receives through the DRX IDCconfiguration and the TDM IDC indicator are values for reconfiguring theexisting DRX configuration values.

As another example (embodiment 2), the terminal may receive the MAC mainconfiguration information element in which not only the existing DRXconfiguration but also the DRX IDC configuration and the TDM IDCindicator are included. The DRX IDC configuration information mayinclude configuration information on the DRX inactivity timer, the DRXretransmission timer, and the DRX short cycle timer. As shown in Table 4above, the DRX inactivity timer may be configured as psf0, the DRXretransmission timer may be configured as psf0, and the DRX short cycletimer may be configured as a value in the range from 1 to 16, or a newvalue that is larger. The new value may be configured as a very largevalue, such as 2560, or an infinite value, and thus the DRX short cycletimer may be configured to be stopped only through the RRC connectionreconfiguration or release.

In this case, the terminal may reconfigure the existing DRXconfiguration values with respect to changed values among valuesreceived through the DRX configuration that is not related to IDC andvalues received through the DRX IDC configuration and the TDM IDCindicator. That is, with respect to the DRX inactivity timer, the DRXretransmission timer, and the DRX short cycle timer, a new value for IDCis signaled in addition to the existing DRX configuration value, andIDC-related values can be selected by the terminal.

As still another example (embodiment 3), the MAC main configurationinformation element that the terminal receives includes values relatedto the DRX IDC configuration (this is called new DRX configuration).That is, the new DRX configuration includes new configuration valuesthat are different from the existing values with respect to the DRXinactivity timer, the DRX retransmission timer, and the DRX short periodtimer, and the MAC main configuration information element including thenew DRX configuration is a new information element that is differentfrom the existing information element according to the presentinvention.

According to the present invention, the terminal may receive the MACmain configuration information element in which the new DRXconfiguration and the TDM IDC indicator are included.

In accordance with the new DRX configuration information, the DRXinactivity timer may be configured as psf0, the DRX retransmission timermay be configured as psf0, and the DRX short cycle timer may beconfigured as a new value. The new value may be configured as a verylarge value, such as 2560, or an infinite value, and thus the DRX shortcycle timer may be configured to be stopped only through the RRCconnection reconfiguration or release.

In this case, the terminal reconfigures the configuration values thatare caused by the existing new DRX configuration through the valuesreceived through the new DRX configuration and the TDM IDC indicator.

As still another example (embodiment 4), the terminal receives only theTDM IDC indicator, but configures the DRX in accordance with thepre-engagement in the terminal. The TDM IDC indicator may be included inthe MAC main configuration information element that the terminalreceives from the base station.

In this case, if the TDM IDC indicator is received, the terminal itselfmay configure the DRX inactivity timer as psf0 , configure the DRXretransmission timer as psf0, and configure the DRX short cycle timer asa new value. The new value may be configured as a very large value, suchas 2560, or an infinite value, and thus the DRX short cycle timer may beconfigured to be stopped only through the RRC connection reconfigurationor release.

On the other hand, the values (psf0 and 2560) presented in the signalingtechnique are examples, and other values may be configured on the basisof the TDM IDC indicator. However, the base station does not transmitaccurate values, but the system determines the values in advance.Accordingly, the values are already known in the terminal and the basestation through separate signaling. Through the reception of the TDM IDCindicator, the known values are configured by the terminal.

In the above-described embodiment 1 to embodiment 4, the CQI masking isset up by the TDM IDC indicator, and the non-scheduled cycle (forexample, the ISM transmission cycle in the TDM operation) may beprotected. For example, a parameter “Cqi-Mask” of a CQI reportconfiguration information element may be configured as “setup”.

To follow the step S2305, the terminal performs the IDC resolutionoperation, and performs the TDM operation as the IDC resolutionoperation based on the IDC resolution order (S2310). As an example ofthe TDM operation, an operation, which autonomously denies the ISM bandtransmission, of the scheduling request operation and the random accessoperation may be performed. The operation of the DRX timer and CQI, PMI,PTI, or RI follow the values configured according to the MAC mainconfiguration information elements previously received.

As an example, in the scheduling request operation, in transmitting thescheduling request in the non-scheduled cycle, an autonomous denialoperation, as illustrated in FIG. 12 or 13, may be performed inaccordance with the determination of the terminal. In the terminal, LTEQoS (Quality of Service) and ISM QoS are compared with each other, andthe autonomous denial operation may be configured to be performed aslong as the LTE QoS does not decrease below a predetermined value.

As another example, in the scheduling request operation, even if ascheduling request is pending, the non-scheduled cycle may start. Thatis, in the case where the non-scheduled cycle starts in accordance withthe operation of other timers even if a scheduling request is pending,the scheduled cycle, that is, the DRX active time, is not maintained inthe DRX operation used for IDC. Accordingly, if a scheduling request ispending in a DRX operation that is not for the purpose of IDC, theoperation is performed in the active time, during which the reception ofthe PDCCH is possible for the corresponding time, regardless of theoperation of other timers. However, in a DRX operation that is for thepurpose of IDC, the operation is performed in the non-active time,during which the reception of the PDCCH is not performed, even if ascheduling request is pending.

As still another example, in changing the scheduling request operation,the operation of a scheduling request pending counter SR_COUNTER may bechanged. Here, the scheduling request pending counter monitors thepending state of the scheduling request at every transmit time interval(TTI), and if the scheduling request is pending, the scheduling requestpending counter increments by 1. If the count value of the schedulingrequest pending counter exceeds a predetermined counter upper limitvalue (dsr-TransMax), the random access operation starts for the purposeof the scheduling request. However, since in the DRX operation used forthe purpose of IDC, the DRX active time may not start even if ascheduling request is pending, the counter increment operation in theDRX non-active time, that is, in the non-scheduled cycle, may be delayedwith respect to the corresponding counter. That is, during the DRXnon-active time, the counter operation is delayed even if the schedulingrequest is pending, and the counter may not increment at each transmittime interval. When the DRX active time is resumed, the correspondingcounter increments again.

As still another example, in the scheduling request operation, thescheduling request may be permitted even in the DRX non-active time.That is, although the base station is unable to grant the terminaluplink resources with respect to the scheduling request in thecorresponding non-active time, the terminal can perform thecorresponding request with respect to the base station for the purposeof transferring the necessity of the uplink transmission. The basestation may grant the uplink transmission resources through the nextactive time in response to the corresponding request, or may change thepattern of the DRX for the purpose of IDC. As an example, in order tolengthen the scheduled cycle for LTE transmission of the correspondingterminal, a longer DRX on-duration timer may be configured.

In the random access operation, in the terminal that has performed thepreamble transmission, the LTE QoS and the ISM QoS are compared witheach other, and the autonomous denial operation may be performed as longas the LTE QoS does not decrease too much.

As an example, if a RAR window region exists outside the on-durationtimer operation region, the ISM transmission may be autonomously deniedand postponed temporarily with respect to the whole of the correspondingRAR window region.

As another example, if the RAR window region exists outside theon-duration timer operation region, partial ISM transmission may beautonomously denied with respect to the RAR window region, and thepartial ISM transmission may be postponed. In principle, the autonomousdenial of the ISM transmission is performed with respect to PDCCHregions, and the LTE reception of the terminal is protected. Whether todeny the ISM transmission with respect to non-PDCCH regions isdetermined based on the PDCCH regions. If no downlink resourceallocation exists in the non-PDCCH regions indicated by the PDCCHs ofthe subframes, it is not necessary to deny the ISM transmission, andthus the ISM transmission is permitted. If the downlink resourceallocation exists in the non-PDCCH region indicated by the PDCCH of thesubframes, it is not necessary to deny the ISM transmission, and thusthe ISM transmission is permitted.

If the PDCCH is a PDCCH that is not scrambled by the RA-RNTI, whichindicates the existence of a RAR MAC CE, it is not necessary to performthe ISM autonomous denial with respect not only to the correspondingPDCCH but also to the non-PDCCH region indicated by the PDCCH. However,with respect to the subframe region which is called by the PDCCH region,which is scrambled by the RA-RNTI, indicating the existence of the RARMAC CE, ISM autonomous denial may be performed for the RAR reception.That is, in the RAR reception window, partial autonomous denial could beperformed with respect to the ISM.

As another example, with respect to the operation for semi-persistentscheduling (SPS), ISM autonomous denial may be performed by theterminal. The LTE QoS and the ISM QoS may be compared with each other inthe terminal in a manner similar to the scheduling request operation,and the autonomous denial operation may be configured to be performed aslong as the LTE QoS does not decrease below a predetermined value.

FIG. 24 is a flowchart illustrating the operation of a base station thatcontrols in-device coexistence interference according to the presentinvention.

Referring to FIG. 24, the base station receives the IDC indicationinformation from the terminal (S2400). The IDC indication information(or IDC support information) may be indication information that isdiscriminated with respect to the TDM operation or the FDM operation, orindication information that is integrated with the TDM operation or theFDM operation. In this case, the indication information discriminatedwith respect to the TDM operation or the FDM operation may havepriority, such that the terminal can request the TDM operation or theFDM operation, which are IDC resolutions on the terminal side.

Further, the measurement result may be included in the IDC indicationinformation. The measurement result may be used to determine which IDCresolution is more suitable. For example, if the target cell for the FDMoperation has poor channel quality, the base station may select the TDMsolution to solve the IDC problem of the serving cell.

The base station may receive the IDC indication information through anIDC indication message, a measurement report message, or a proximityindication message, which is a new message format. The IDC indicationmessage (measurement report message or proximity indication message) mayinclude unusable frequency band information. As an example, the IDCindication message (measurement report message or proximity indicationmessage) may include an EARFCN value of the unusable frequency band.

On the other hand, the IDC indication message (measurement reportmessage or proximity indication message) may include TDM patterninformation. The TDM pattern may be a DRX cycle, a DRX active cycle, ora DRX subframe offset value.

Further, the IDC indication message (measurement report message orproximity indication message) may include the result of measurementconsidering IDC or the result of measurement excluding IDC in accordancewith the rules according to which the terminal acquires the measurementsamples. The measurement results included in the IDC indication message(measurement report message or proximity indication message) may includeat least one of the IDC strength, the IDC activity, the measurementresult considering IDC, and the measurement result excluding IDC.

To follow the step S2400, the base station selects the most suitable IDCresolution based on the IDC indication information received from theterminal (S2405). In this case, the IDC resolution may be an FDMoperation or a TDM operation. The FDM operation or the TDM operation maybe an operation according to FIGS. 5 to 13. As an example, if it isdetermined that there is no problem in the usable frequency bandaccording to the IDC indication information through the load balance,and that handover is not greatly influenced (for example, if the RSRP orRSRQ value of the corresponding frequency band is sufficiently large)when a problem occurs in the frequency band through which the basestation provides service, the FDM operation may be performed, andotherwise, the TDM operation may be performed in the serving cell. TheTDM operation based on DRX in the case where the IDC resolution is theTDM operation according to the present invention will be described.

To follow the step S2405, the base station transmits the IDC resolutionorder on the IDC resolution method to the terminal (S2410). For example,the IDC resolution order may be transmitted through the RRC connectionreconfiguration message.

As an example, if the determined IDC resolution order is the TDMoperation, the base station may transmit the TDM IDC indicatorindicating that the DRX pattern is caused by IDC together with aspecific DRX pattern through the RRC connection reconfiguration message.

As another example, if the determined IDC resolution order is the TDMoperation, the base station may transmit the DRX configurationinformation, such as a specific DRX pattern, through the RRC connectionreconfiguration message.

As still another example, the IDC resolution order may include theoperation of a prohibition timer that prohibits transmission of the IDCindication message (measurement report message or proximity indicationmessage) for a predetermined time.

Alternatively, if the IDC resolution operation that the base stationdetermines based on the IDC indication information is the same as theIDC resolution operation that is currently in progress, the IDCresolution order procedure may be omitted.

Alternatively, the base station may directly transmit DRX configurationinformation including an accurate value on the DRX pattern to theterminal. Further, the base station may transmit only the TDM IDCindicator, but may order that an autonomous DRX pattern value is to beconfigured, depending on the configuration in the terminal.

As an example (embodiment 5), the base station may transmit the MAC mainconfiguration information element in which the DRX IDC configuration andthe TDM IDC indicator are included. The DRX IDC configuration mayinclude configuration information on the DRX inactivity timer, the DRXretransmission timer, and the DRX short cycle timer. As shown in Table 3above, the DRX inactivity timer may be configured as psf0, the DRXretransmission timer may be configured as psf0, and the DRX short cycletimer may be configured as a value in the range of 1 to 16, or a newvalue that is larger. The new value may be configured as a very largevalue, such as 2560, or an infinite value, and thus the DRX short cycletimer may be configured to be stopped only through the RRC connectionreconfiguration or release.

If the DRX inactivity timer is configured as psf0, the DRX inactivitytimer starts through the reception of the PDCCH that indicates the newtransmission and then immediately expires. Accordingly, the DRXinactivity timer does not have any influence on the active time. If theon-duration timer has expired, the active time is not maintained by theinfluence of the DRX inactivity timer even if a PDCCH that indicates thenew transmission is received.

If the DRX retransmission timer is configured as psf0, the DRXretransmission timer does not have an influence on the active time dueto the failure of data decoding in the HARQ procedure. If theon-duration timer has expired, the active time is not maintained by thevalue of the DRX retransmission timer even if data decoding fails in theHARQ procedure.

In this case, the values that the base station transmits through the DRXIDC configuration and the TDM IDC indicator are values for reconfiguringthe existing DRX configuration values.

As another example (embodiment 6), the base station may transmit the MACmain configuration information element in which not only the existingDRX configuration but also the DRX IDC configuration and the TDM IDCindicator are included. The DRX IDC configuration information mayinclude configuration information on the DRX inactivity timer, the DRXretransmission timer, and the DRX short cycle timer. As shown in Table 4above, the DRX inactivity timer may be configured as psf0, the DRXretransmission timer may be configured as psf0, and the DRX short cycletimer may be configured as a value in the range of 1 to 16 or a newvalue that is larger. The new value may be configured as a very largevalue, such as 2560, or an infinite value, and thus the DRX short cycletimer may be configured to be stopped only through the RRC connectionreconfiguration or release.

In this case, the terminal may reconfigure the existing DRXconfiguration values with respect to changed values among values thatthe base station transmits through the DRX configuration that is notrelated to IDC and values that the base station transmits through theDRX IDC configuration and the TDM IDC indicator. That is, with respectto the DRX inactivity timer, the DRX retransmission timer, and the DRXshort cycle timer, a new value for IDC is signaled in addition to theexisting DRX configuration value, and IDC-related values can be selectedby the terminal.

As still another example (embodiment 7), the MAC main configurationinformation element that the base station transmits includes valuesrelated to the DRX IDC configuration (this is called new DRXconfiguration). That is, the new DRX configuration includes newconfiguration values that are different from the existing values withrespect to the DRX inactivity timer, the DRX retransmission timer, andthe DRX short period timer, and the MAC main configuration informationelement including the new DRX configuration is a new information elementthat is different from the existing information element according to thepresent invention.

According to the present invention, the base station may transmit theMAC main configuration information element in which the new DRXconfiguration and the TDM IDC indicator are included.

In accordance with the new DRX configuration information, the DRXinactivity timer may be configured as psf0, the DRX retransmission timermay be configured as psf0, and the DRX short cycle timer may beconfigured as a new value. The new value may be configured as a verylarge value, such as 2560, or an infinite value, and thus the DRX shortcycle timer may be configured to be stopped only through the RRCconnection reconfiguration or release.

In this case, the configuration values by the existing new DRXconfiguration are reconfigured by the values that the base stationtransmits through the new DRX configuration and the TDM IDC indicator.

As still another example (embodiment 8), the base station transmits onlythe TDM IDC indicator, but may order that the DRX is to be configured inaccordance with the pre-engagement in the terminal. The TDM IDCindicator may be included in the MAC main configuration informationelement that the base station transmits to the terminal. In this case,if the TDM IDC indicator is received, the terminal itself may configurethe DRX inactivity timer as psf0, configure the DRX retransmission timeras psf0, and configure the DRX short cycle timer as a new value. The newvalue may be configured as a very large value, such as 2560, or aninfinite value, and thus the DRX short cycle timer may be configured tobe stopped only through the RRC connection reconfiguration or release.

However, the values (psf0 and 2560) presented in the signaling techniqueare examples, and other values may be configured on the basis of the TDMIDC indicator. However, the base station does not transmit accuratevalues, but the system determines the values in advance. Accordingly,the values are already known in the terminal and the base stationthrough separate signaling. Through the reception of the TDM IDCindicator, the known values are configured by the terminal.

In the above-described embodiment 5 to embodiment 8, the CQI masking isset up by the TDM IDC indicator, and the non-scheduled cycle (forexample, the ISM transmission cycle in the TDM operation) may beprotected. For example, a parameter “Cqi-Mask” of a CQI reportconfiguration information element may be configured as “setup”.

Through the above-described IDC resolution order, the terminal mayperform the IDC resolution operation.

FIG. 25 is an exemplary block diagram of a terminal and a base stationcontrolling in-device coexistence interference according to the presentinvention.

Referring to FIG. 25, a terminal 2500 includes a reception unit 2505, anIDC resolution unit 2510, and a transmission unit 2515.

Referring to FIG. 25, the transmission unit 2515 performs the IDCindication operation through transmission of the IDC indicationinformation to the base station 2550. The IDC indication information (orIDC support information) may be indication information that isdiscriminated with respect to the TDM operation or the FDM operation, orindication information that is integrated with the TDM operation or theFDM operation. In this case, the indication information discriminatedwith respect to the TDM operation or the FDM operation may have prioritysuch that the terminal 2500 can request the TDM operation or the FDMoperation, which are IDC resolutions on the side of the terminal 2500.Further, the measurement result may be included in the IDC indicationinformation. The measurement result may be used to determine which IDCresolution is more suitable. For example, if the target cell for the FDMoperation has poor channel quality, the base station 2550 may select theTDM solution to solve the IDC problem of the serving cell.

The transmission unit 2515 may perform the IDC indication operation bytransmitting an IDC indication message, a measurement report message, ora proximity indication message, which is a new message format, to thebase station 2550. The IDC indication message (measurement reportmessage or proximity indication message) may include unusable frequencyband information. As an example, the IDC indication message (measurementreport message or proximity indication message) may include an EARFCNvalue of the unusable frequency band. On the other hand, the IDCindication message (measurement report message or proximity indicationmessage) may include TDM pattern information. The TDM pattern may be aDRX cycle, a DRX active cycle, or a DRX subframe offset value. Further,the IDC indication message (measurement report message or proximityindication message) may include the result of measurement consideringIDC or the result of measurement excluding IDC in accordance with therules according to which the terminal 2500 acquires the measurementsamples. The measurement results included in the IDC indication message(measurement report message or proximity indication message) may includeat least one of the IDC strength, the IDC activity, the measurementresult considering IDC, and the measurement result excluding IDC.

The reception unit 2505 receives the most suitable IDC resolution orderthat the base station 2550 selects based on the IDC indicationinformation from the base station 2550. For example, the IDC resolutionorder may be transmitted through the RRC connection reconfigurationmessage. As an example, if the determined IDC resolution order is theTDM operation, the reception unit 2505 may receive the TDM IDC indicatorindicating that the DRX pattern is caused by IDC together with aspecific DRX pattern through the RRC connection reconfiguration message.As another example, if the determined IDC resolution order is the TDMoperation, the reception unit 2505 may receive the DRX configurationinformation, such as a specific DRX pattern, through the RRC connectionreconfiguration message. As still another example, if the determined IDCresolution order is the TDM operation, the transmission unit 2515 maydeny the HARQ retransmission in the LTE band for handling a beacon whilethe signal is transmitted in the ISM band. That is, the start of the IDCresolution order may be requested through the IDC indication message (ormeasurement report message or proximity indication message). As stillanother example, the IDC resolution order may include the operation of aprohibition timer that prohibits the transmission of the IDC indicationmessage (measurement report message or proximity indication message) fora predetermined time.

On the other hand, if the IDC resolution operation that the base station2550 determines based on the IDC indication information is the same asthe IDC resolution operation that is currently in progress, the IDCresolution order procedure may be omitted.

The reception unit 2505 may directly receive the DRX configurationinformation including an accurate value on the DRX pattern from the basestation 2550. Further, the reception unit 2505 receives only the IDCindicator, but an autonomous DRX pattern value may be configureddepending on the configuration in the terminal 2500.

As an example, the reception unit 2505 may receive the MAC mainconfiguration information element in which the DRX IDC configuration andthe TDM IDC indicator are included. The DRX IDC configuration mayinclude configuration information on the DRX inactivity timer, the DRXretransmission timer, and the DRX short cycle timer. As shown in Table 3above, the DRX inactivity timer may be configured as psf0, the DRXretransmission timer may be configured as psf0, and the DRX short cycletimer may be configured as a value in the range of 1 to 16, or a newvalue that is larger. The new value may be configured as a very largevalue, such as 2560, or an infinite value, and thus the DRX short cycletimer may be configured to be stopped only through the RRC connectionreconfiguration or release. If the DRX inactivity timer is configured aspsf0, the DRX inactivity timer starts through the reception of the PDCCHthat indicates the new transmission and then immediately expires.Accordingly, the DRX inactivity timer does not exert an influence on theactive time. If the on-duration timer has expired, the active time isnot maintained by the influence of the DRX inactivity timer even if thePDCCH that indicates the new transmission is received. If the DRXretransmission timer is configured as psf0, the DRX retransmission timerdoes not exert an influence on the active time due to the failure ofdata decoding in the HARQ procedure. If the on-duration timer hasexpired, the active time is not maintained by the value of the DRXretransmission timer even if data decoding fails in the HARQ procedure.In this case, the values that the reception unit 2505 receives throughthe DRX IDC configuration and the TDM IDC indicator are values forreconfiguring the existing DRX configuration values.

As another example, the reception unit 2505 may receive the MAC mainconfiguration information element in which not only the existing DRXconfiguration but also the DRX IDC configuration and the TDM IDCindicator are included. The DRX IDC configuration information mayinclude configuration information on the DRX inactivity timer, the DRXretransmission timer, and the DRX short cycle timer. As shown in Table 4above, the DRX inactivity timer may be configured as psf0, the DRXretransmission timer may be configured as psf0, and the DRX short cycletimer may be configured as a value in the range of 1 to 16, or a newvalue that is larger. The new value may be configured as a very largevalue, such as 2560, or an infinite value, and thus the DRX short cycletimer may be configured to be stopped only through the RRC connectionreconfiguration or release. In this case, the reception unit 2505 mayreconfigure the existing DRX configuration values with respect tochanged values among values received through a DRX configuration that isnot related to IDC and values received through the DRX IDC configurationand the TDM IDC indicator. That is, with respect to the DRX inactivitytimer, the DRX retransmission timer, and the DRX short cycle timer, anew value for IDC is signaled in addition to the existing DRXconfiguration value, and IDC-related values can be selected by theterminal 2500.

As still another example, the MAC main configuration information elementthat the reception unit 2505 receives includes values related to the DRXIDC configuration (this is called new DRX configuration). That is, thenew DRX configuration includes new configuration values that aredifferent from the existing values with respect to the DRX inactivitytimer, the DRX retransmission timer, and the DRX short period timer, andthe MAC main configuration information element including the new DRXconfiguration is a new information element according to the presentinvention. According to the present invention, the reception unit 2505may receive the MAC main configuration information element in which thenew DRX configuration and the TDM IDC indicator are included. Inaccordance with the new DRX configuration information, the DRXinactivity timer may be configured as psf0, the DRX retransmission timermay be configured as psf0, and the DRX short cycle timer may beconfigured as a new value. The new value may be configured as a verylarge value, such as 2560, or an infinite value, and thus the DRX shortcycle timer may be configured to be stopped only through the RRCconnection reconfiguration or release. In this case, the reception unit2505 reconfigures the configuration values that are caused by theexisting new DRX configuration through the values received through thenew DRX configuration and the TDM IDC indicator.

As still another example, the reception unit 2505 receives only the TDMIDC indicator, but the IDC resolution unit 2510 configures the DRX inaccordance with the pre-engagement in the terminal 2500. The TDM IDCindicator may be included in the MAC main configuration informationelement that the reception unit 2505 receives from the base station2550. In this case, if the reception unit 2505 receives the TDM IDCindicator, the terminal 2500 itself may configure the DRX inactivitytimer as psf0, configure the DRX retransmission timer as psf0, andconfigure the DRX short cycle timer as a new value. The new value may beconfigured as a very large value, such as 2560, or an infinite value,and thus the DRX short cycle timer may be configured to be stopped onlythrough the RRC connection reconfiguration or release. On the otherhand, the values (psf0 and 2560) presented in the signaling techniqueare examples, and other values may be configured on the basis of the TDMIDC indicator. However, the base station 2550 does not transmit accuratevalues, but the system determines the values in advance. Accordingly,the values are already known in the terminal 2500 and the base station2550 through separate signaling. Through the reception of the TDM IDCindicator, the known values are configured by the terminal 2500.

The CQI masking is set up by the TDM IDC indicator and the non-scheduledcycle (for example, the ISM transmission cycle in the TDM operation) maybe protected. For example, a parameter “Cqi-Mask” of a CQI reportconfiguration information element may be configured as “setup”.

The IDC resolution unit 2510 performs the IDC resolution operation, andperforms the TDM operation as the IDC resolution operation based on theIDC resolution order. As an example of the TDM operation, an operationthat autonomously denies the ISM band transmission of the schedulingrequest operation and the random access operation may be performed. Theoperation of the DRX timer and CQI, PMI, PTI, or RI follow the valuesconfigured according to the MAC main configuration information elementspreviously received. Further, in the scheduling request operation, evenif the scheduling request is pending, the non-scheduled cycle may start,the operation of the scheduling request pending counter SR_COUNTER maybe changed, or the scheduling request may be permitted even in the DRXinactivity timer.

As an example, in transmitting the scheduling request in thenon-scheduled cycle, an autonomous denial operation as illustrated inFIG. 12 or 13 may be performed in accordance with the determination ofthe terminal 2500. In the terminal 2500, LTE QoS (Quality of Service)and ISM QoS are compared with each other, and the autonomous denialoperation may be configured to be performed as long as the LTE QoS doesnot decrease below a predetermined value.

As another example, in performing the random access operation, in theterminal 2500 that has performed the preamble transmission, the IDCresolution unit 2510 may compare the LTE QoS and the ISM QoS with eachother, and perform the autonomous denial operation as long as the LTEQoS does not decrease too much.

As an example, if a RAR window region exists outside the on-durationtimer operation region, the IDC resolution unit 2510 may autonomouslydeny and hold temporarily with respect to the whole of the correspondingRAR window region.

As another example, if the RAR window region exists outside theon-duration timer operation region, the IDC resolution unit 2510 mayautonomously deny and postpone partial ISM transmission with respect tothe RAR window region. In principle, the autonomous denial of the ISMtransmission is performed with respect to PDCCH regions, and the LTEreception of the terminal 2500 is protected. Whether to deny the ISMtransmission with respect to non-PDCCH regions is determined based onthe PDCCH regions. If downlink resource allocation does not exist in thenon-PDCCH regions indicated by the PDCCHs of the subframes, it is notnecessary to deny the ISM transmission, and thus the ISM transmission ispermitted. If downlink resource allocation exists in the non-PDCCHregion indicated by the PDCCH of the subframes, it is not necessary todeny the ISM transmission, and thus the ISM transmission is permitted.

If the PDCCH is a PDCCH that is not scrambled by the RA-RNTI, whichindicates the existence of a RAR MAC CE, it is not necessary to performthe ISM autonomous denial with respect not only to the correspondingPDCCH but also to the non-PDCCH region indicated by the PDCCH. However,with respect to the subframe region that is called by the PDCCH regionthat is scrambled by the RA-RNTI indicating the existence of the RAR MACCE, the ISM autonomous denial may be performed for the RAR reception.That is, in the RAR reception window, partial autonomous denial could beperformed with respect to the ISM. That is, if the PDCCH has beenscrambled by the RA-RNTI, the ISM autonomous denial would be performedwith respect to the PDCCH region of the subframe region that is calledby the corresponding PDCCH.

The base station 2550 includes a reception unit 2555, an IDC resolutionselection unit 2560, and a transmission unit 2565.

The reception unit 2555 receives the IDC indication information from theterminal 2500. The IDC indication information (or IDC supportinformation) may be indication information that is discriminated withrespect to the TDM operation or the FDM operation, or indicationinformation that is integrated with the TDM operation or the FDMoperation. In this case, the indication information discriminated withrespect to the TDM operation or the FDM operation may request priorityof the TDM operation or the FDM operation, which are IDC resolutionmethods on the side of the terminal 2500.

Further, the measurement result may be included in the IDC indicationinformation. The measurement result may be used to determine which IDCresolution is more suitable. For example, if the target cell for the FDMoperation has poor channel quality, the IDC resolution selection unit2560 may select the TDM solution to solve the IDC problem of the servingcell.

The reception unit 2555 may receive the IDC indication informationthrough an IDC indication message, a measurement report message, or aproximity indication message, which is a new message format. The IDCindication message (measurement report message or proximity indicationmessage) may include unusable frequency band information. As an example,the IDC indication message (measurement report message or proximityindication message) may include an EARFCN value of the unusablefrequency band. On the other hand, the IDC indication message(measurement report message or proximity indication message) may includeTDM pattern information. The TDM pattern may be a DRX cycle, a DRXactive cycle, or a DRX subframe offset value. Further, the IDCindication message (measurement report message or proximity indicationmessage) may include the result of measurement considering IDC or theresult of measurement excluding IDC in accordance with the rulesaccording to which the terminal 2500 acquires the measurement samples.The measurement results included in the IDC indication message(measurement report message or proximity indication message) may includeat least one of the IDC strength, the IDC activity, the measurementresult considering IDC, and the measurement result excluding IDC.

The IDC resolution selection unit 2560 selects the most suitable IDCresolution based on the IDC indication information received from theterminal (S2405). In this case, the IDC resolution may be an FDMoperation or a TDM operation. The FDM operation or the TDM operation maybe an operation according to FIGS. 5 to 13. As an example, if it isdetermined that there is no problem in the usable frequency bandaccording to the IDC indication information through the load balance andhandover is not greatly influenced (for example, if the RSRP or RSRQvalue of the corresponding frequency band is sufficiently large) when aproblem occurs in the frequency band through which the base station 2550provides service, the FDM operation may be performed, and otherwise, theTDM operation may be performed in the serving cell. The TDM operationbased on the DRX in the case where the IDC resolution is the TDMoperation according to the present invention will be described.

The transmission unit 2565 transmits the IDC resolution order on the IDCresolution method to the terminal 2500. For example, the IDC resolutionorder may be transmitted through the RRC connection reconfigurationmessage.

As an example, if the determined IDC resolution order is the TDMoperation, the transmission unit 2565 may transmit the TDM IDC indicatorindicating that the DRX pattern is caused by IDC together with aspecific DRX pattern through the RRC connection reconfiguration message.

As another example, if the determined IDC resolution order is the TDMoperation, the transmission unit 2565 may transmit the DRX configurationinformation, such as a specific DRX pattern, through the RRC connectionreconfiguration message.

As still another example, the IDC resolution order may include theoperation of a prohibition timer that prohibits transmission of the IDCindication message (measurement report message or proximity indicationmessage) for a predetermined time.

On the other hand, if the IDC resolution operation that the IDCresolution selection unit 2560 determines based on the IDC indicationinformation is the same as the IDC resolution operation that iscurrently in progress, the IDC resolution order procedure may beomitted.

On the other hand, the transmission unit 2565 may directly transmit theDRX configuration information including an accurate value on the DRXpattern to the terminal 2500. Further, the transmission unit 2565 maytransmit only the TDM IDC indicator, but may order that an autonomousDRX pattern value is to be configured depending on the configuration inthe terminal 2500.

As an example, the transmission unit 2565 may transmit the MAC mainconfiguration information element in which the DRX IDC configuration andthe TDM IDC indicator are included. The DRX IDC configuration mayinclude configuration information on the DRX inactivity timer, the DRXretransmission timer, and the DRX short cycle timer. As shown in Table 3above, the DRX inactivity timer may be configured as psf0, the DRXretransmission timer may be configured as psf0, and the DRX short cycletimer may be configured as a value in the range of 1 to 16, or a newvalue that is larger. The new value may be configured as a very largevalue, such as 2560, or an infinite value, and thus the DRX short cycletimer may be configured to be stopped only through the RRC connectionreconfiguration or release. If the DRX inactivity timer is configured aspsf0, the DRX inactivity timer starts through the reception of the PDCCHthat indicates the new transmission and then immediately expires.Accordingly, the DRX inactivity timer does not exert an influence on theactive time. If the on-duration timer has expired, the active time isnot maintained by the influence of the DRX inactivity timer even if thePDCCH that indicates the new transmission is received.

If the DRX retransmission timer is configured as psf0, the DRXretransmission timer does not exert an influence on the active time dueto failure of data decoding in the HARQ procedure. If the on-durationtimer has expired, the active time is not maintained by the value of theDRX retransmission timer even if data decoding fails in the HARQprocedure. In this case, the values that the transmission unit 2565transmits through the DRX IDC configuration and the TDM IDC indicatorare values for reconfiguring the existing DRX configuration values.

As another example, the transmission unit 2565 may transmit the MAC mainconfiguration information element in which not only the existing DRXconfiguration but also the DRX IDC configuration and the TDM IDCindicator are included. The DRX IDC configuration information mayinclude configuration information on the DRX inactivity timer, the DRXretransmission timer, and the DRX short cycle timer. As shown in Table 4above, the DRX inactivity timer may be configured as psf0, the DRXretransmission timer may be configured as psf0, and the DRX short cycletimer may be configured as a value in the range of 1 to 16, or a newvalue that is larger. The new value may be configured as a very largevalue, such as 2560, or an infinite value, and thus the DRX short cycletimer may be configured to be stopped only through the RRC connectionreconfiguration or release. In this case, the terminal 2500 mayreconfigure the existing DRX configuration values with respect tochanged values among values that the transmission unit 2565 transmitsthrough RX configuration that is not related to IDC and values that thebase station transmits through the DRX IDC configuration and the TDM IDCindicator. That is, with respect to the DRX inactivity timer, the DRXretransmission timer, and the DRX short cycle timer, a new value for IDCis indicated in addition to the existing DRX configuration value, andIDC-related values can be selected by the terminal 2500.

As still another example, the MAC main configuration information elementthat the transmission unit 2565 transmits includes values related to theDRX IDC configuration (this is called new DRX configuration). That is,the new DRX configuration includes new configuration values that aredifferent from the existing values with respect to the DRX inactivitytimer, the DRX retransmission timer, and the DRX short period timer, andthe MAC main configuration information element including the new DRXconfiguration is a new information element that is different from theexisting information element according to the present invention.

According to the present invention, the transmission unit 2565 maytransmit the MAC main configuration information element in which the newDRX configuration and the TDM IDC indicator are included.

In accordance with the new DRX configuration information, the DRXinactivity timer may be configured as psf0, the DRX retransmission timermay be configured as psf0, and the DRX short cycle timer may beconfigured as a new value. The new value may be configured as a verylarge value, such as 2560, or an infinite value, and thus the DRX shortcycle timer may be configured to be stopped only through the RRCconnection reconfiguration or release.

In this case, the configuration values from the existing new DRXconfiguration are reconfigured according to the values that thetransmission unit 2565 transmits through the new DRX configuration andthe TDM IDC indicator.

As still another example, the transmission unit 2565 transmits only theTDM IDC indicator, but may order that the DRX be configured inaccordance with the pre-engagement in the terminal 2500. The TDM IDCindicator may be included in the MAC main configuration informationelement that the transmission unit 2565 transmits to the terminal 2500.In this case, if the TDM IDC indicator is received, the terminal 2500itself may configure the DRX inactivity timer as psf0, configure the DRXretransmission timer as psf0, and configure the DRX short cycle timer asa new value. The new value may be configured as a very large value, suchas 2560, or an infinite value, and thus the DRX short cycle timer may beconfigured to be stopped only through the RRC connection reconfigurationor release. However, the values (psf0 and 2560) presented in thesignaling technique are examples, and other values may be configured onthe basis of the TDM IDC indicator. However, the transmission unit 2565does not transmit accurate values, but the system determines the valuesin advance. Accordingly, the values are already known in the terminal2500 and the base station 2550 through separate signaling. Through thereception of the TDM IDC indicator, the known values are configured bythe terminal 2500.

The CQI masking is set up by the TDM IDC indicator, and thenon-scheduled cycle (for example, the ISM transmission cycle in the TDMoperation) may be protected. For example, a parameter “Cqi-Mask” of aCQI report configuration information element may be configured as“setup”.

According to the present invention, it is possible to cause TDMoperation related to in-device coexistence interference to be performed,and to transmit DRX configuration information related to the TDMoperation.

According to the present invention, the terminal can perform autonomousdenial, either entirely or partially, with respect to an ISM band inorder to control in-device coexistence interference, and can performautonomous denial selectively with respect to a region indicated by aPDCCH.

The above-described embodiments of the present invention are merelyexemplary, and it will be understood by those of ordinary skill in theart that various changes and modifications are possible withoutdeparting from the scope of the present invention. Accordingly, theabove-described embodiments are not to limit the technical concept ofthe present invention, but to explain the same, and the scope of thepresent invention is defined by the appended claims rather than thedetailed description as described above. It is to be understood that allcorrections and modifications derived from the meanings and scope of thefollowing claims and the equivalent concept fall within the scope of thepresent invention.

What is claimed is:
 1. A method for controlling interference in a MobileStation (MS), comprising: receiving, from a Base Station (BS), RadioResource Control (RRC) connection reconfiguration including In-devicecoexistence (IDC) Discontinuous Reception (DRX) configurationreconfiguring DRX relating to an unusable frequency band based on IDCindication information; and reconfiguring DRX based on the IDC DRXconfiguration to perform autonomous denial of Industrial ScientificMedical (ISM) transmission in the unusable frequency band, wherein theIDC DRX configuration includes information configuring a DRXretransmission timer and information configuring a DRX short cycle to apredetermined cycle for avoiding the IDC interference, and wherein theRRC connection reconfiguration further includes information forconfiguring a time-division multiplexing (TDM) pattern which is notrelated to IDC interference.
 2. The method of claim 1, wherein the IDCindication information is transmitted to the BS, the IDC indicationinformation including the unusable frequency band that is a frequencyband in which performing communication is interfered by IDCinterference.
 3. The method of claim 1, wherein the autonomous denial ofISM transmission in the unusable frequency band autonomously denies atransmission of a scheduling request.
 4. The method of claim 1, whereinthe autonomous denial of ISM transmission in the unusable frequency bandautonomously denies the ISM transmission with respect to a physicaldownlink control channel (PDCCH) region in a random access operation andautonomously denies the ISM transmission with respect to a non-PDCCHregion in a case where downlink resource allocation exists in thenon-PDCCH region that is indicated by the PDCCH region.
 5. A MobileStation (MS) for controlling interference in the MS, comprising: areceiver to receive, from a Base Station (BS), Radio Resource Control(RRC) connection reconfiguration including In-device coexistence (IDC)Discontinuous Reception (DRX) configuration reconfiguring DRX relatingto an unusable frequency band based on IDC indication information; andan IDC resolution processor to reconfigure DRX based on the IDC DRXconfiguration to autonomously deny Industrial Scientific Medical (ISM)transmission in the unusable frequency band, wherein the IDC DRXconfiguration includes information configuring a DRX retransmissiontimer and information configuring a DRX short cycle to a predeterminedcycle for avoiding the IDC interference, and wherein the RRC connectionreconfiguration further includes information for configuring atime-division multiplexing (TDM) pattern which is not related to IDCinterference.
 6. The MS of claim 5, wherein the IDC indicationinformation is transmitted to the BS, the IDC indication informationincluding the unusable frequency band that is a frequency band in whichperforming communication is interfered by IDC interference.
 7. The MS ofclaim 5, wherein the IDC resolution processor autonomously denies atransmission of a scheduling request.
 8. The MS of claim 5, wherein theIDC resolution processor autonomously denies the ISM transmission withrespect to a physical downlink control channel (PDCCH) region in arandom access operation and autonomously denies the ISM transmissionwith respect to a non-PDCCH region in a case where downlink resourceallocation exists in the non-PDCCH region that is indicated by the PDCCHregion.
 9. A method for controlling interference in a Base Station (BS),comprising: receiving, from a Mobile Station (MS), IDC indicationinformation including an unusable frequency band that is a frequencyband in which performing communication is interfered by IDCinterference; determining IDC Discontinuous Reception (DRX)configuration reconfiguring DRX relating to the unusable frequency bandbased on the IDC indication information, and selecting IDC resolutionoperation autonomously denying Industrial Scientific Medical (ISM)transmission in the unusable frequency band; and transmitting, to theUE, Radio Resource Control (RRC) connection reconfiguration includingthe IDC DRX configuration and the IDC resolution operation; wherein theIDC DRX configuration includes information configuring a DRXretransmission timer and information configuring a DRX short cycle to apredetermined cycle for avoiding the IDC interference, and wherein theRRC connection reconfiguration further includes information forconfiguring a time-division multiplexing (TDM) pattern which is notrelated to IDC interference.
 10. The method of claim 9, furthercomprising: analyzing the IDC indication information to determine IDCDiscontinuous Reception (DRX) configuration associated with the unusablefrequency.
 11. The method of claim 9, wherein the DRX pattern based onthe IDC DRX configuration is information reconfiguring the TDM patternwhich is not related to IDC interference.
 12. The method of claim 9,wherein the IDC resolution operation comprises autonomously denying atransmission of a scheduling request.
 13. The method of claim 9, whereinthe IDC resolution operation comprises autonomously denying the ISMtransmission with respect to a physical downlink control channel (PDCCH)region in a random access operation and autonomously denying the ISMtransmission with respect to a non-PDCCH region in a case where downlinkresource allocation exists in the non-PDCCH region that is indicated bythe PDCCH region.